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linux/net/ipv6/addrconf.c
James Prestwood 18ac597af2 net: ndisc: introduce ndisc_evict_nocarrier sysctl parameter 
In most situations the neighbor discovery cache should be cleared on a
NOCARRIER event which is currently done unconditionally. But for wireless
roams the neighbor discovery cache can and should remain intact since
the underlying network has not changed.

This patch introduces a sysctl option ndisc_evict_nocarrier which can
be disabled by a wireless supplicant during a roam. This allows packets
to be sent after a roam immediately without having to wait for
neighbor discovery.

A user reported roughly a 1 second delay after a roam before packets
could be sent out (note, on IPv4). This delay was due to the ARP
cache being cleared. During testing of this same scenario using IPv6
no delay was noticed, but regardless there is no reason to clear
the ndisc cache for wireless roams.

Signed-off-by: James Prestwood <prestwoj@gmail.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2021-11-01 19:57:14 -07:00

7337 lines
178 KiB
C
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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* IPv6 Address [auto]configuration
* Linux INET6 implementation
*
* Authors:
* Pedro Roque <roque@di.fc.ul.pt>
* Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
*/
/*
* 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/sched/signal.h>
#include <linux/socket.h>
#include <linux/sockios.h>
#include <linux/net.h>
#include <linux/inet.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 <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/6lowpan.h>
#include <net/firewire.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 <net/l3mdev.h>
#include <linux/if_tunnel.h>
#include <linux/rtnetlink.h>
#include <linux/netconf.h>
#include <linux/random.h>
#include <linux/uaccess.h>
#include <asm/unaligned.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/export.h>
#include <linux/ioam6.h>
#define INFINITY_LIFE_TIME 0xFFFFFFFF
#define IPV6_MAX_STRLEN \
sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
static inline u32 cstamp_delta(unsigned long cstamp)
{
return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
}
static inline s32 rfc3315_s14_backoff_init(s32 irt)
{
/* multiply 'initial retransmission time' by 0.9 .. 1.1 */
u64 tmp = (900000 + prandom_u32() % 200001) * (u64)irt;
do_div(tmp, 1000000);
return (s32)tmp;
}
static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt)
{
/* multiply 'retransmission timeout' by 1.9 .. 2.1 */
u64 tmp = (1900000 + prandom_u32() % 200001) * (u64)rt;
do_div(tmp, 1000000);
if ((s32)tmp > mrt) {
/* multiply 'maximum retransmission time' by 0.9 .. 1.1 */
tmp = (900000 + prandom_u32() % 200001) * (u64)mrt;
do_div(tmp, 1000000);
}
return (s32)tmp;
}
#ifdef CONFIG_SYSCTL
static int addrconf_sysctl_register(struct inet6_dev *idev);
static void addrconf_sysctl_unregister(struct inet6_dev *idev);
#else
static inline int addrconf_sysctl_register(struct inet6_dev *idev)
{
return 0;
}
static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
{
}
#endif
static void ipv6_gen_rnd_iid(struct in6_addr *addr);
static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
static int ipv6_count_addresses(const struct inet6_dev *idev);
static int ipv6_generate_stable_address(struct in6_addr *addr,
u8 dad_count,
const struct inet6_dev *idev);
#define IN6_ADDR_HSIZE_SHIFT 8
#define IN6_ADDR_HSIZE (1 << IN6_ADDR_HSIZE_SHIFT)
/*
* 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(void);
static void addrconf_verify_rtnl(void);
static void addrconf_verify_work(struct work_struct *);
static struct workqueue_struct *addrconf_wq;
static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
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, bool unregister);
static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
int plen,
const struct net_device *dev,
u32 flags, u32 noflags,
bool no_gw);
static void addrconf_dad_start(struct inet6_ifaddr *ifp);
static void addrconf_dad_work(struct work_struct *w);
static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
bool send_na);
static void addrconf_dad_run(struct inet6_dev *idev, bool restart);
static void addrconf_rs_timer(struct timer_list *t);
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 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,
.mldv1_unsolicited_report_interval = 10 * HZ,
.mldv2_unsolicited_report_interval = HZ,
.dad_transmits = 1,
.rtr_solicits = MAX_RTR_SOLICITATIONS,
.rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
.rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
.rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
.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,
.max_addresses = IPV6_MAX_ADDRESSES,
.accept_ra_defrtr = 1,
.ra_defrtr_metric = IP6_RT_PRIO_USER,
.accept_ra_from_local = 0,
.accept_ra_min_hop_limit= 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_min_plen = 0,
.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 = 0,
.suppress_frag_ndisc = 1,
.accept_ra_mtu = 1,
.stable_secret = {
.initialized = false,
},
.use_oif_addrs_only = 0,
.ignore_routes_with_linkdown = 0,
.keep_addr_on_down = 0,
.seg6_enabled = 0,
#ifdef CONFIG_IPV6_SEG6_HMAC
.seg6_require_hmac = 0,
#endif
.enhanced_dad = 1,
.addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
.disable_policy = 0,
.rpl_seg_enabled = 0,
.ioam6_enabled = 0,
.ioam6_id = IOAM6_DEFAULT_IF_ID,
.ioam6_id_wide = IOAM6_DEFAULT_IF_ID_WIDE,
.ndisc_evict_nocarrier = 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,
.force_mld_version = 0,
.mldv1_unsolicited_report_interval = 10 * HZ,
.mldv2_unsolicited_report_interval = HZ,
.dad_transmits = 1,
.rtr_solicits = MAX_RTR_SOLICITATIONS,
.rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
.rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
.rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
.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,
.max_addresses = IPV6_MAX_ADDRESSES,
.accept_ra_defrtr = 1,
.ra_defrtr_metric = IP6_RT_PRIO_USER,
.accept_ra_from_local = 0,
.accept_ra_min_hop_limit= 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_min_plen = 0,
.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,
.suppress_frag_ndisc = 1,
.accept_ra_mtu = 1,
.stable_secret = {
.initialized = false,
},
.use_oif_addrs_only = 0,
.ignore_routes_with_linkdown = 0,
.keep_addr_on_down = 0,
.seg6_enabled = 0,
#ifdef CONFIG_IPV6_SEG6_HMAC
.seg6_require_hmac = 0,
#endif
.enhanced_dad = 1,
.addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
.disable_policy = 0,
.rpl_seg_enabled = 0,
.ioam6_enabled = 0,
.ioam6_id = IOAM6_DEFAULT_IF_ID,
.ioam6_id_wide = IOAM6_DEFAULT_IF_ID_WIDE,
.ndisc_evict_nocarrier = 1,
};
/* Check if link is ready: is it up and is a valid qdisc available */
static inline bool addrconf_link_ready(const struct net_device *dev)
{
return netif_oper_up(dev) && !qdisc_tx_is_noop(dev);
}
static void addrconf_del_rs_timer(struct inet6_dev *idev)
{
if (del_timer(&idev->rs_timer))
__in6_dev_put(idev);
}
static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
{
if (cancel_delayed_work(&ifp->dad_work))
__in6_ifa_put(ifp);
}
static void addrconf_mod_rs_timer(struct inet6_dev *idev,
unsigned long when)
{
if (!timer_pending(&idev->rs_timer))
in6_dev_hold(idev);
mod_timer(&idev->rs_timer, jiffies + when);
}
static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
unsigned long delay)
{
in6_ifa_hold(ifp);
if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay))
in6_ifa_put(ifp);
}
static int snmp6_alloc_dev(struct inet6_dev *idev)
{
int i;
idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
if (!idev->stats.ipv6)
goto err_ip;
for_each_possible_cpu(i) {
struct ipstats_mib *addrconf_stats;
addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
u64_stats_init(&addrconf_stats->syncp);
}
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:
free_percpu(idev->stats.ipv6);
err_ip:
return -ENOMEM;
}
static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
{
struct inet6_dev *ndev;
int err = -ENOMEM;
ASSERT_RTNL();
if (dev->mtu < IPV6_MIN_MTU)
return ERR_PTR(-EINVAL);
ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
if (!ndev)
return ERR_PTR(err);
rwlock_init(&ndev->lock);
ndev->dev = dev;
INIT_LIST_HEAD(&ndev->addr_list);
timer_setup(&ndev->rs_timer, addrconf_rs_timer, 0);
memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
if (ndev->cnf.stable_secret.initialized)
ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
ndev->cnf.mtu6 = dev->mtu;
ndev->ra_mtu = 0;
ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
if (!ndev->nd_parms) {
kfree(ndev);
return ERR_PTR(err);
}
if (ndev->cnf.forwarding)
dev_disable_lro(dev);
/* We refer to the device */
dev_hold(dev);
if (snmp6_alloc_dev(ndev) < 0) {
netdev_dbg(dev, "%s: cannot allocate memory for statistics\n",
__func__);
neigh_parms_release(&nd_tbl, ndev->nd_parms);
dev_put(dev);
kfree(ndev);
return ERR_PTR(err);
}
if (snmp6_register_dev(ndev) < 0) {
netdev_dbg(dev, "%s: cannot create /proc/net/dev_snmp6/%s\n",
__func__, dev->name);
goto err_release;
}
/* One reference from device. */
refcount_set(&ndev->refcnt, 1);
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
INIT_LIST_HEAD(&ndev->tempaddr_list);
ndev->desync_factor = U32_MAX;
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;
}
ndev->token = in6addr_any;
if (netif_running(dev) && addrconf_link_ready(dev))
ndev->if_flags |= IF_READY;
ipv6_mc_init_dev(ndev);
ndev->tstamp = jiffies;
err = addrconf_sysctl_register(ndev);
if (err) {
ipv6_mc_destroy_dev(ndev);
snmp6_unregister_dev(ndev);
goto err_release;
}
/* protected by rtnl_lock */
rcu_assign_pointer(dev->ip6_ptr, ndev);
/* Join interface-local all-node multicast group */
ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
/* 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;
err_release:
neigh_parms_release(&nd_tbl, ndev->nd_parms);
ndev->dead = 1;
in6_dev_finish_destroy(ndev);
return ERR_PTR(err);
}
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 (IS_ERR(idev))
return idev;
}
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 */
bool all = false;
if (type == NETCONFA_ALL)
all = true;
if (all || type == NETCONFA_FORWARDING)
size += nla_total_size(4);
#ifdef CONFIG_IPV6_MROUTE
if (all || type == NETCONFA_MC_FORWARDING)
size += nla_total_size(4);
#endif
if (all || type == NETCONFA_PROXY_NEIGH)
size += nla_total_size(4);
if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
size += nla_total_size(4);
return size;
}
static int 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;
bool all = false;
nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
flags);
if (!nlh)
return -EMSGSIZE;
if (type == NETCONFA_ALL)
all = true;
ncm = nlmsg_data(nlh);
ncm->ncm_family = AF_INET6;
if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
goto nla_put_failure;
if (!devconf)
goto out;
if ((all || type == NETCONFA_FORWARDING) &&
nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
goto nla_put_failure;
#ifdef CONFIG_IPV6_MROUTE
if ((all || type == NETCONFA_MC_FORWARDING) &&
nla_put_s32(skb, NETCONFA_MC_FORWARDING,
devconf->mc_forwarding) < 0)
goto nla_put_failure;
#endif
if ((all || type == NETCONFA_PROXY_NEIGH) &&
nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
goto nla_put_failure;
if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
devconf->ignore_routes_with_linkdown) < 0)
goto nla_put_failure;
out:
nlmsg_end(skb, nlh);
return 0;
nla_put_failure:
nlmsg_cancel(skb, nlh);
return -EMSGSIZE;
}
void inet6_netconf_notify_devconf(struct net *net, int event, int type,
int ifindex, struct ipv6_devconf *devconf)
{
struct sk_buff *skb;
int err = -ENOBUFS;
skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL);
if (!skb)
goto errout;
err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
event, 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_KERNEL);
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) },
[NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
[NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
};
static int inet6_netconf_valid_get_req(struct sk_buff *skb,
const struct nlmsghdr *nlh,
struct nlattr **tb,
struct netlink_ext_ack *extack)
{
int i, err;
if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) {
NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf get request");
return -EINVAL;
}
if (!netlink_strict_get_check(skb))
return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg),
tb, NETCONFA_MAX,
devconf_ipv6_policy, extack);
err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg),
tb, NETCONFA_MAX,
devconf_ipv6_policy, extack);
if (err)
return err;
for (i = 0; i <= NETCONFA_MAX; i++) {
if (!tb[i])
continue;
switch (i) {
case NETCONFA_IFINDEX:
break;
default:
NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in netconf get request");
return -EINVAL;
}
}
return 0;
}
static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
struct nlmsghdr *nlh,
struct netlink_ext_ack *extack)
{
struct net *net = sock_net(in_skb->sk);
struct nlattr *tb[NETCONFA_MAX+1];
struct inet6_dev *in6_dev = NULL;
struct net_device *dev = NULL;
struct sk_buff *skb;
struct ipv6_devconf *devconf;
int ifindex;
int err;
err = inet6_netconf_valid_get_req(in_skb, nlh, tb, extack);
if (err < 0)
return err;
if (!tb[NETCONFA_IFINDEX])
return -EINVAL;
err = -EINVAL;
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)
return -EINVAL;
in6_dev = in6_dev_get(dev);
if (!in6_dev)
goto errout;
devconf = &in6_dev->cnf;
break;
}
err = -ENOBUFS;
skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL);
if (!skb)
goto errout;
err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
NETLINK_CB(in_skb).portid,
nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
NETCONFA_ALL);
if (err < 0) {
/* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
WARN_ON(err == -EMSGSIZE);
kfree_skb(skb);
goto errout;
}
err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
errout:
if (in6_dev)
in6_dev_put(in6_dev);
dev_put(dev);
return err;
}
static int inet6_netconf_dump_devconf(struct sk_buff *skb,
struct netlink_callback *cb)
{
const struct nlmsghdr *nlh = cb->nlh;
struct net *net = sock_net(skb->sk);
int h, s_h;
int idx, s_idx;
struct net_device *dev;
struct inet6_dev *idev;
struct hlist_head *head;
if (cb->strict_check) {
struct netlink_ext_ack *extack = cb->extack;
struct netconfmsg *ncm;
if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) {
NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf dump request");
return -EINVAL;
}
if (nlmsg_attrlen(nlh, sizeof(*ncm))) {
NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in netconf dump request");
return -EINVAL;
}
}
s_h = cb->args[0];
s_idx = idx = cb->args[1];
for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
idx = 0;
head = &net->dev_index_head[h];
rcu_read_lock();
cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
net->dev_base_seq;
hlist_for_each_entry_rcu(dev, head, index_hlist) {
if (idx < s_idx)
goto cont;
idev = __in6_dev_get(dev);
if (!idev)
goto cont;
if (inet6_netconf_fill_devconf(skb, dev->ifindex,
&idev->cnf,
NETLINK_CB(cb->skb).portid,
nlh->nlmsg_seq,
RTM_NEWNETCONF,
NLM_F_MULTI,
NETCONFA_ALL) < 0) {
rcu_read_unlock();
goto done;
}
nl_dump_check_consistent(cb, nlmsg_hdr(skb));
cont:
idx++;
}
rcu_read_unlock();
}
if (h == NETDEV_HASHENTRIES) {
if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
net->ipv6.devconf_all,
NETLINK_CB(cb->skb).portid,
nlh->nlmsg_seq,
RTM_NEWNETCONF, NLM_F_MULTI,
NETCONFA_ALL) < 0)
goto done;
else
h++;
}
if (h == NETDEV_HASHENTRIES + 1) {
if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
net->ipv6.devconf_dflt,
NETLINK_CB(cb->skb).portid,
nlh->nlmsg_seq,
RTM_NEWNETCONF, NLM_F_MULTI,
NETCONFA_ALL) < 0)
goto done;
else
h++;
}
done:
cb->args[0] = h;
cb->args[1] = idx;
return skb->len;
}
#ifdef CONFIG_SYSCTL
static void 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);
ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
} else {
ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
ipv6_dev_mc_dec(dev, &in6addr_sitelocal_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), RTM_NEWNETCONF,
NETCONFA_FORWARDING,
dev->ifindex, &idev->cnf);
}
static void addrconf_forward_change(struct net *net, __s32 newf)
{
struct net_device *dev;
struct inet6_dev *idev;
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, RTM_NEWNETCONF,
NETCONFA_FORWARDING,
NETCONFA_IFINDEX_DEFAULT,
net->ipv6.devconf_dflt);
rtnl_unlock();
return 0;
}
if (p == &net->ipv6.devconf_all->forwarding) {
int old_dflt = net->ipv6.devconf_dflt->forwarding;
net->ipv6.devconf_dflt->forwarding = newf;
if ((!newf) ^ (!old_dflt))
inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
NETCONFA_FORWARDING,
NETCONFA_IFINDEX_DEFAULT,
net->ipv6.devconf_dflt);
addrconf_forward_change(net, newf);
if ((!newf) ^ (!old))
inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
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;
}
static void addrconf_linkdown_change(struct net *net, __s32 newf)
{
struct net_device *dev;
struct inet6_dev *idev;
for_each_netdev(net, dev) {
idev = __in6_dev_get(dev);
if (idev) {
int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
idev->cnf.ignore_routes_with_linkdown = newf;
if (changed)
inet6_netconf_notify_devconf(dev_net(dev),
RTM_NEWNETCONF,
NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
dev->ifindex,
&idev->cnf);
}
}
}
static int addrconf_fixup_linkdown(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->ignore_routes_with_linkdown) {
if ((!newf) ^ (!old))
inet6_netconf_notify_devconf(net,
RTM_NEWNETCONF,
NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
NETCONFA_IFINDEX_DEFAULT,
net->ipv6.devconf_dflt);
rtnl_unlock();
return 0;
}
if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
addrconf_linkdown_change(net, newf);
if ((!newf) ^ (!old))
inet6_netconf_notify_devconf(net,
RTM_NEWNETCONF,
NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
NETCONFA_IFINDEX_ALL,
net->ipv6.devconf_all);
}
rtnl_unlock();
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 (cancel_delayed_work(&ifp->dad_work))
pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
ifp);
if (ifp->state != INET6_IFADDR_STATE_DEAD) {
pr_warn("Freeing alive inet6 address %p\n", ifp);
return;
}
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_rcu(&ifp->if_list, p);
}
static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr)
{
u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net);
return hash_32(val, IN6_ADDR_HSIZE_SHIFT);
}
static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
struct net_device *dev, unsigned int hash)
{
struct inet6_ifaddr *ifp;
hlist_for_each_entry(ifp, &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 || ifp->idev->dev == dev)
return true;
}
}
return false;
}
static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa)
{
unsigned int hash = inet6_addr_hash(dev_net(dev), &ifa->addr);
int err = 0;
spin_lock(&addrconf_hash_lock);
/* Ignore adding duplicate addresses on an interface */
if (ipv6_chk_same_addr(dev_net(dev), &ifa->addr, dev, hash)) {
netdev_dbg(dev, "ipv6_add_addr: already assigned\n");
err = -EEXIST;
} else {
hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
}
spin_unlock(&addrconf_hash_lock);
return err;
}
/* On success it returns ifp with increased reference count */
static struct inet6_ifaddr *
ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg,
bool can_block, struct netlink_ext_ack *extack)
{
gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC;
int addr_type = ipv6_addr_type(cfg->pfx);
struct net *net = dev_net(idev->dev);
struct inet6_ifaddr *ifa = NULL;
struct fib6_info *f6i = NULL;
int err = 0;
if (addr_type == IPV6_ADDR_ANY ||
(addr_type & IPV6_ADDR_MULTICAST &&
!(cfg->ifa_flags & IFA_F_MCAUTOJOIN)) ||
(!(idev->dev->flags & IFF_LOOPBACK) &&
!netif_is_l3_master(idev->dev) &&
addr_type & IPV6_ADDR_LOOPBACK))
return ERR_PTR(-EADDRNOTAVAIL);
if (idev->dead) {
err = -ENODEV; /*XXX*/
goto out;
}
if (idev->cnf.disable_ipv6) {
err = -EACCES;
goto out;
}
/* validator notifier needs to be blocking;
* do not call in atomic context
*/
if (can_block) {
struct in6_validator_info i6vi = {
.i6vi_addr = *cfg->pfx,
.i6vi_dev = idev,
.extack = extack,
};
err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi);
err = notifier_to_errno(err);
if (err < 0)
goto out;
}
ifa = kzalloc(sizeof(*ifa), gfp_flags | __GFP_ACCOUNT);
if (!ifa) {
err = -ENOBUFS;
goto out;
}
f6i = addrconf_f6i_alloc(net, idev, cfg->pfx, false, gfp_flags);
if (IS_ERR(f6i)) {
err = PTR_ERR(f6i);
f6i = NULL;
goto out;
}
if (net->ipv6.devconf_all->disable_policy ||
idev->cnf.disable_policy)
f6i->dst_nopolicy = true;
neigh_parms_data_state_setall(idev->nd_parms);
ifa->addr = *cfg->pfx;
if (cfg->peer_pfx)
ifa->peer_addr = *cfg->peer_pfx;
spin_lock_init(&ifa->lock);
INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
INIT_HLIST_NODE(&ifa->addr_lst);
ifa->scope = cfg->scope;
ifa->prefix_len = cfg->plen;
ifa->rt_priority = cfg->rt_priority;
ifa->flags = cfg->ifa_flags;
/* No need to add the TENTATIVE flag for addresses with NODAD */
if (!(cfg->ifa_flags & IFA_F_NODAD))
ifa->flags |= IFA_F_TENTATIVE;
ifa->valid_lft = cfg->valid_lft;
ifa->prefered_lft = cfg->preferred_lft;
ifa->cstamp = ifa->tstamp = jiffies;
ifa->tokenized = false;
ifa->rt = f6i;
ifa->idev = idev;
in6_dev_hold(idev);
/* For caller */
refcount_set(&ifa->refcnt, 1);
rcu_read_lock_bh();
err = ipv6_add_addr_hash(idev->dev, ifa);
if (err < 0) {
rcu_read_unlock_bh();
goto out;
}
write_lock(&idev->lock);
/* Add to inet6_dev unicast addr list. */
ipv6_link_dev_addr(idev, ifa);
if (ifa->flags&IFA_F_TEMPORARY) {
list_add(&ifa->tmp_list, &idev->tempaddr_list);
in6_ifa_hold(ifa);
}
in6_ifa_hold(ifa);
write_unlock(&idev->lock);
rcu_read_unlock_bh();
inet6addr_notifier_call_chain(NETDEV_UP, ifa);
out:
if (unlikely(err < 0)) {
fib6_info_release(f6i);
if (ifa) {
if (ifa->idev)
in6_dev_put(ifa->idev);
kfree(ifa);
}
ifa = ERR_PTR(err);
}
return ifa;
}
enum cleanup_prefix_rt_t {
CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
};
/*
* Check, whether the prefix for ifp would still need a prefix route
* after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
* constants.
*
* 1) we don't purge prefix if address was not permanent.
* prefix is managed by its own lifetime.
* 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
* 3) if there are no addresses, delete prefix.
* 4) if there are still other permanent address(es),
* corresponding prefix is still permanent.
* 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
* don't purge the prefix, assume user space is managing it.
* 6) otherwise, update prefix lifetime to the
* longest valid lifetime among the corresponding
* addresses on the device.
* Note: subsequent RA will update lifetime.
**/
static enum cleanup_prefix_rt_t
check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
{
struct inet6_ifaddr *ifa;
struct inet6_dev *idev = ifp->idev;
unsigned long lifetime;
enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
*expires = jiffies;
list_for_each_entry(ifa, &idev->addr_list, if_list) {
if (ifa == ifp)
continue;
if (ifa->prefix_len != ifp->prefix_len ||
!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
ifp->prefix_len))
continue;
if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
return CLEANUP_PREFIX_RT_NOP;
action = CLEANUP_PREFIX_RT_EXPIRE;
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);
}
return action;
}
static void
cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires,
bool del_rt, bool del_peer)
{
struct fib6_info *f6i;
f6i = addrconf_get_prefix_route(del_peer ? &ifp->peer_addr : &ifp->addr,
ifp->prefix_len,
ifp->idev->dev, 0, RTF_DEFAULT, true);
if (f6i) {
if (del_rt)
ip6_del_rt(dev_net(ifp->idev->dev), f6i, false);
else {
if (!(f6i->fib6_flags & RTF_EXPIRES))
fib6_set_expires(f6i, expires);
fib6_info_release(f6i);
}
}
}
/* This function wants to get referenced ifp and releases it before return */
static void ipv6_del_addr(struct inet6_ifaddr *ifp)
{
int state;
enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
unsigned long expires;
ASSERT_RTNL();
spin_lock_bh(&ifp->lock);
state = ifp->state;
ifp->state = INET6_IFADDR_STATE_DEAD;
spin_unlock_bh(&ifp->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(&ifp->idev->lock);
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);
}
if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
action = check_cleanup_prefix_route(ifp, &expires);
list_del_rcu(&ifp->if_list);
__in6_ifa_put(ifp);
write_unlock_bh(&ifp->idev->lock);
addrconf_del_dad_work(ifp);
ipv6_ifa_notify(RTM_DELADDR, ifp);
inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
if (action != CLEANUP_PREFIX_RT_NOP) {
cleanup_prefix_route(ifp, expires,
action == CLEANUP_PREFIX_RT_DEL, false);
}
/* clean up prefsrc entries */
rt6_remove_prefsrc(ifp);
out:
in6_ifa_put(ifp);
}
static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, bool block)
{
struct inet6_dev *idev = ifp->idev;
unsigned long tmp_tstamp, age;
unsigned long regen_advance;
unsigned long now = jiffies;
s32 cnf_temp_preferred_lft;
struct inet6_ifaddr *ift;
struct ifa6_config cfg;
long max_desync_factor;
struct in6_addr addr;
int ret = 0;
write_lock_bh(&idev->lock);
retry:
in6_dev_hold(idev);
if (idev->cnf.use_tempaddr <= 0) {
write_unlock_bh(&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_bh(&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_gen_rnd_iid(&addr);
age = (now - ifp->tstamp) / HZ;
regen_advance = idev->cnf.regen_max_retry *
idev->cnf.dad_transmits *
max(NEIGH_VAR(idev->nd_parms, RETRANS_TIME), HZ/100) / HZ;
/* recalculate max_desync_factor each time and update
* idev->desync_factor if it's larger
*/
cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft);
max_desync_factor = min_t(__u32,
idev->cnf.max_desync_factor,
cnf_temp_preferred_lft - regen_advance);
if (unlikely(idev->desync_factor > max_desync_factor)) {
if (max_desync_factor > 0) {
get_random_bytes(&idev->desync_factor,
sizeof(idev->desync_factor));
idev->desync_factor %= max_desync_factor;
} else {
idev->desync_factor = 0;
}
}
memset(&cfg, 0, sizeof(cfg));
cfg.valid_lft = min_t(__u32, ifp->valid_lft,
idev->cnf.temp_valid_lft + age);
cfg.preferred_lft = cnf_temp_preferred_lft + age - idev->desync_factor;
cfg.preferred_lft = min_t(__u32, ifp->prefered_lft, cfg.preferred_lft);
cfg.plen = ifp->prefix_len;
tmp_tstamp = ifp->tstamp;
spin_unlock_bh(&ifp->lock);
write_unlock_bh(&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.
* Use age calculation as in addrconf_verify to avoid unnecessary
* temporary addresses being generated.
*/
age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
if (cfg.preferred_lft <= regen_advance + age) {
in6_ifa_put(ifp);
in6_dev_put(idev);
ret = -1;
goto out;
}
cfg.ifa_flags = IFA_F_TEMPORARY;
/* set in addrconf_prefix_rcv() */
if (ifp->flags & IFA_F_OPTIMISTIC)
cfg.ifa_flags |= IFA_F_OPTIMISTIC;
cfg.pfx = &addr;
cfg.scope = ipv6_addr_scope(cfg.pfx);
ift = ipv6_add_addr(idev, &cfg, block, NULL);
if (IS_ERR(ift)) {
in6_ifa_put(ifp);
in6_dev_put(idev);
pr_info("%s: retry temporary address regeneration\n", __func__);
write_lock_bh(&idev->lock);
goto retry;
}
spin_lock_bh(&ift->lock);
ift->ifpub = ifp;
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;
}
/*
* 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,
IPV6_SADDR_RULE_PRIVACY,
IPV6_SADDR_RULE_ORCHID,
IPV6_SADDR_RULE_PREFIX,
#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
IPV6_SADDR_RULE_NOT_OPTIMISTIC,
#endif
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 bool ipv6_use_optimistic_addr(struct net *net,
struct inet6_dev *idev)
{
#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
if (!idev)
return false;
if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
return false;
if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic)
return false;
return true;
#else
return false;
#endif
}
static bool ipv6_allow_optimistic_dad(struct net *net,
struct inet6_dev *idev)
{
#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
if (!idev)
return false;
if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
return false;
return true;
#else
return false;
#endif
}
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 destination.
* | 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 */
u8 avoid = IFA_F_DEPRECATED;
if (!ipv6_use_optimistic_addr(net, score->ifa->idev))
avoid |= IFA_F_OPTIMISTIC;
ret = ipv6_saddr_preferred(score->addr_type) ||
!(score->ifa->flags & avoid);
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;
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;
}
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;
#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
/* Optimistic addresses still have lower precedence than other
* preferred addresses.
*/
ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
break;
#endif
default:
ret = 0;
}
if (ret)
__set_bit(i, score->scorebits);
score->rule = i;
out:
return ret;
}
static int __ipv6_dev_get_saddr(struct net *net,
struct ipv6_saddr_dst *dst,
struct inet6_dev *idev,
struct ipv6_saddr_score *scores,
int hiscore_idx)
{
struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
list_for_each_entry_rcu(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)) {
net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
idev->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 out;
}
break;
} else if (minihiscore < miniscore) {
swap(hiscore, score);
hiscore_idx = 1 - hiscore_idx;
/* restore our iterator */
score->ifa = hiscore->ifa;
break;
}
}
}
out:
return hiscore_idx;
}
static int ipv6_get_saddr_master(struct net *net,
const struct net_device *dst_dev,
const struct net_device *master,
struct ipv6_saddr_dst *dst,
struct ipv6_saddr_score *scores,
int hiscore_idx)
{
struct inet6_dev *idev;
idev = __in6_dev_get(dst_dev);
if (idev)
hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
scores, hiscore_idx);
idev = __in6_dev_get(master);
if (idev)
hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
scores, hiscore_idx);
return hiscore_idx;
}
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], *hiscore;
struct ipv6_saddr_dst dst;
struct inet6_dev *idev;
struct net_device *dev;
int dst_type;
bool use_oif_addr = false;
int hiscore_idx = 0;
int ret = 0;
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;
scores[hiscore_idx].rule = -1;
scores[hiscore_idx].ifa = NULL;
rcu_read_lock();
/* 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.)
* - "It is RECOMMENDED that the candidate source addresses
* be the set of unicast addresses assigned to the
* interface that will be used to send to the destination
* (the 'outgoing' interface)." (RFC 6724)
*/
if (dst_dev) {
idev = __in6_dev_get(dst_dev);
if ((dst_type & IPV6_ADDR_MULTICAST) ||
dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
(idev && idev->cnf.use_oif_addrs_only)) {
use_oif_addr = true;
}
}
if (use_oif_addr) {
if (idev)
hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
} else {
const struct net_device *master;
int master_idx = 0;
/* if dst_dev exists and is enslaved to an L3 device, then
* prefer addresses from dst_dev and then the master over
* any other enslaved devices in the L3 domain.
*/
master = l3mdev_master_dev_rcu(dst_dev);
if (master) {
master_idx = master->ifindex;
hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
master, &dst,
scores, hiscore_idx);
if (scores[hiscore_idx].ifa)
goto out;
}
for_each_netdev_rcu(net, dev) {
/* only consider addresses on devices in the
* same L3 domain
*/
if (l3mdev_master_ifindex_rcu(dev) != master_idx)
continue;
idev = __in6_dev_get(dev);
if (!idev)
continue;
hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
}
}
out:
hiscore = &scores[hiscore_idx];
if (!hiscore->ifa)
ret = -EADDRNOTAVAIL;
else
*saddr = hiscore->ifa->addr;
rcu_read_unlock();
return ret;
}
EXPORT_SYMBOL(ipv6_dev_get_saddr);
int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
u32 banned_flags)
{
struct inet6_ifaddr *ifp;
int err = -EADDRNOTAVAIL;
list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
if (ifp->scope > IFA_LINK)
break;
if (ifp->scope == IFA_LINK &&
!(ifp->flags & banned_flags)) {
*addr = ifp->addr;
err = 0;
break;
}
}
return err;
}
int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
u32 banned_flags)
{
struct inet6_dev *idev;
int err = -EADDRNOTAVAIL;
rcu_read_lock();
idev = __in6_dev_get(dev);
if (idev) {
read_lock_bh(&idev->lock);
err = __ipv6_get_lladdr(idev, addr, banned_flags);
read_unlock_bh(&idev->lock);
}
rcu_read_unlock();
return err;
}
static int ipv6_count_addresses(const struct inet6_dev *idev)
{
const struct inet6_ifaddr *ifp;
int cnt = 0;
rcu_read_lock();
list_for_each_entry_rcu(ifp, &idev->addr_list, if_list)
cnt++;
rcu_read_unlock();
return cnt;
}
int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
const struct net_device *dev, int strict)
{
return ipv6_chk_addr_and_flags(net, addr, dev, !dev,
strict, IFA_F_TENTATIVE);
}
EXPORT_SYMBOL(ipv6_chk_addr);
/* device argument is used to find the L3 domain of interest. If
* skip_dev_check is set, then the ifp device is not checked against
* the passed in dev argument. So the 2 cases for addresses checks are:
* 1. does the address exist in the L3 domain that dev is part of
* (skip_dev_check = true), or
*
* 2. does the address exist on the specific device
* (skip_dev_check = false)
*/
static struct net_device *
__ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
const struct net_device *dev, bool skip_dev_check,
int strict, u32 banned_flags)
{
unsigned int hash = inet6_addr_hash(net, addr);
struct net_device *l3mdev, *ndev;
struct inet6_ifaddr *ifp;
u32 ifp_flags;
rcu_read_lock();
l3mdev = l3mdev_master_dev_rcu(dev);
if (skip_dev_check)
dev = NULL;
hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
ndev = ifp->idev->dev;
if (!net_eq(dev_net(ndev), net))
continue;
if (l3mdev_master_dev_rcu(ndev) != l3mdev)
continue;
/* Decouple optimistic from tentative for evaluation here.
* Ban optimistic addresses explicitly, when required.
*/
ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
? (ifp->flags&~IFA_F_TENTATIVE)
: ifp->flags;
if (ipv6_addr_equal(&ifp->addr, addr) &&
!(ifp_flags&banned_flags) &&
(!dev || ndev == dev ||
!(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
rcu_read_unlock();
return ndev;
}
}
rcu_read_unlock();
return NULL;
}
int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
const struct net_device *dev, bool skip_dev_check,
int strict, u32 banned_flags)
{
return __ipv6_chk_addr_and_flags(net, addr, dev, skip_dev_check,
strict, banned_flags) ? 1 : 0;
}
EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
/* Compares an address/prefix_len with addresses on device @dev.
* If one is found it returns true.
*/
bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
const unsigned int prefix_len, struct net_device *dev)
{
const struct inet6_ifaddr *ifa;
const struct inet6_dev *idev;
bool ret = false;
rcu_read_lock();
idev = __in6_dev_get(dev);
if (idev) {
list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
if (ret)
break;
}
}
rcu_read_unlock();
return ret;
}
EXPORT_SYMBOL(ipv6_chk_custom_prefix);
int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
{
const struct inet6_ifaddr *ifa;
const struct inet6_dev *idev;
int onlink;
onlink = 0;
rcu_read_lock();
idev = __in6_dev_get(dev);
if (idev) {
list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
onlink = ipv6_prefix_equal(addr, &ifa->addr,
ifa->prefix_len);
if (onlink)
break;
}
}
rcu_read_unlock();
return onlink;
}
EXPORT_SYMBOL(ipv6_chk_prefix);
/**
* ipv6_dev_find - find the first device with a given source address.
* @net: the net namespace
* @addr: the source address
* @dev: used to find the L3 domain of interest
*
* The caller should be protected by RCU, or RTNL.
*/
struct net_device *ipv6_dev_find(struct net *net, const struct in6_addr *addr,
struct net_device *dev)
{
return __ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1,
IFA_F_TENTATIVE);
}
EXPORT_SYMBOL(ipv6_dev_find);
struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
struct net_device *dev, int strict)
{
unsigned int hash = inet6_addr_hash(net, addr);
struct inet6_ifaddr *ifp, *result = NULL;
rcu_read_lock();
hlist_for_each_entry_rcu(ifp, &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 || ifp->idev->dev == dev ||
!(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
result = ifp;
in6_ifa_hold(ifp);
break;
}
}
}
rcu_read_unlock();
return result;
}
/* Gets referenced address, destroys ifaddr */
static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
{
if (dad_failed)
ifp->flags |= IFA_F_DADFAILED;
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, true);
in6_ifa_put(ifpub);
} else {
spin_unlock_bh(&ifp->lock);
}
ipv6_del_addr(ifp);
} else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) {
spin_lock_bh(&ifp->lock);
addrconf_del_dad_work(ifp);
ifp->flags |= IFA_F_TENTATIVE;
if (dad_failed)
ifp->flags &= ~IFA_F_OPTIMISTIC;
spin_unlock_bh(&ifp->lock);
if (dad_failed)
ipv6_ifa_notify(0, ifp);
in6_ifa_put(ifp);
} else {
ipv6_del_addr(ifp);
}
}
static int addrconf_dad_end(struct inet6_ifaddr *ifp)
{
int err = -ENOENT;
spin_lock_bh(&ifp->lock);
if (ifp->state == INET6_IFADDR_STATE_DAD) {
ifp->state = INET6_IFADDR_STATE_POSTDAD;
err = 0;
}
spin_unlock_bh(&ifp->lock);
return err;
}
void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp)
{
struct inet6_dev *idev = ifp->idev;
struct net *net = dev_net(ifp->idev->dev);
if (addrconf_dad_end(ifp)) {
in6_ifa_put(ifp);
return;
}
net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n",
ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source);
spin_lock_bh(&ifp->lock);
if (ifp->flags & IFA_F_STABLE_PRIVACY) {
struct in6_addr new_addr;
struct inet6_ifaddr *ifp2;
int retries = ifp->stable_privacy_retry + 1;
struct ifa6_config cfg = {
.pfx = &new_addr,
.plen = ifp->prefix_len,
.ifa_flags = ifp->flags,
.valid_lft = ifp->valid_lft,
.preferred_lft = ifp->prefered_lft,
.scope = ifp->scope,
};
if (retries > net->ipv6.sysctl.idgen_retries) {
net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
ifp->idev->dev->name);
goto errdad;
}
new_addr = ifp->addr;
if (ipv6_generate_stable_address(&new_addr, retries,
idev))
goto errdad;
spin_unlock_bh(&ifp->lock);
if (idev->cnf.max_addresses &&
ipv6_count_addresses(idev) >=
idev->cnf.max_addresses)
goto lock_errdad;
net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
ifp->idev->dev->name);
ifp2 = ipv6_add_addr(idev, &cfg, false, NULL);
if (IS_ERR(ifp2))
goto lock_errdad;
spin_lock_bh(&ifp2->lock);
ifp2->stable_privacy_retry = retries;
ifp2->state = INET6_IFADDR_STATE_PREDAD;
spin_unlock_bh(&ifp2->lock);
addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
in6_ifa_put(ifp2);
lock_errdad:
spin_lock_bh(&ifp->lock);
}
errdad:
/* transition from _POSTDAD to _ERRDAD */
ifp->state = INET6_IFADDR_STATE_ERRDAD;
spin_unlock_bh(&ifp->lock);
addrconf_mod_dad_work(ifp, 0);
in6_ifa_put(ifp);
}
/* Join to solicited addr multicast group.
* caller must hold RTNL */
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);
}
/* caller must hold RTNL */
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);
}
/* caller must hold RTNL */
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, &addr);
}
/* caller must hold RTNL */
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_6lowpan(u8 *eui, struct net_device *dev)
{
switch (dev->addr_len) {
case ETH_ALEN:
memcpy(eui, dev->dev_addr, 3);
eui[3] = 0xFF;
eui[4] = 0xFE;
memcpy(eui + 5, dev->dev_addr + 3, 3);
break;
case EUI64_ADDR_LEN:
memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
eui[0] ^= 2;
break;
default:
return -1;
}
return 0;
}
static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
{
const union fwnet_hwaddr *ha;
if (dev->addr_len != FWNET_ALEN)
return -1;
ha = (const union fwnet_hwaddr *)dev->dev_addr;
memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
eui[0] ^= 2;
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 addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
{
memcpy(eui, dev->perm_addr, 3);
memcpy(eui + 5, dev->perm_addr + 3, 3);
eui[3] = 0xFF;
eui[4] = 0xFE;
eui[0] ^= 2;
return 0;
}
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:
case ARPHRD_TUNNEL:
return addrconf_ifid_gre(eui, dev);
case ARPHRD_6LOWPAN:
return addrconf_ifid_6lowpan(eui, dev);
case ARPHRD_IEEE1394:
return addrconf_ifid_ieee1394(eui, dev);
case ARPHRD_TUNNEL6:
case ARPHRD_IP6GRE:
case ARPHRD_RAWIP:
return addrconf_ifid_ip6tnl(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_reverse(ifp, &idev->addr_list, if_list) {
if (ifp->scope > IFA_LINK)
break;
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;
}
/* Generation of a randomized Interface Identifier
* draft-ietf-6man-rfc4941bis, Section 3.3.1
*/
static void ipv6_gen_rnd_iid(struct in6_addr *addr)
{
regen:
get_random_bytes(&addr->s6_addr[8], 8);
/* <draft-ietf-6man-rfc4941bis-08.txt>, Section 3.3.1:
* check if generated address is not inappropriate:
*
* - Reserved IPv6 Interface Identifiers
* - XXX: already assigned to an address on the device
*/
/* Subnet-router anycast: 0000:0000:0000:0000 */
if (!(addr->s6_addr32[2] | addr->s6_addr32[3]))
goto regen;
/* IANA Ethernet block: 0200:5EFF:FE00:0000-0200:5EFF:FE00:5212
* Proxy Mobile IPv6: 0200:5EFF:FE00:5213
* IANA Ethernet block: 0200:5EFF:FE00:5214-0200:5EFF:FEFF:FFFF
*/
if (ntohl(addr->s6_addr32[2]) == 0x02005eff &&
(ntohl(addr->s6_addr32[3]) & 0Xff000000) == 0xfe000000)
goto regen;
/* Reserved subnet anycast addresses */
if (ntohl(addr->s6_addr32[2]) == 0xfdffffff &&
ntohl(addr->s6_addr32[3]) >= 0Xffffff80)
goto regen;
}
/*
* Add prefix route.
*/
static void
addrconf_prefix_route(struct in6_addr *pfx, int plen, u32 metric,
struct net_device *dev, unsigned long expires,
u32 flags, gfp_t gfp_flags)
{
struct fib6_config cfg = {
.fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
.fc_metric = 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,
.fc_type = RTN_UNICAST,
};
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, gfp_flags, NULL);
}
static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
int plen,
const struct net_device *dev,
u32 flags, u32 noflags,
bool no_gw)
{
struct fib6_node *fn;
struct fib6_info *rt = NULL;
struct fib6_table *table;
u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
table = fib6_get_table(dev_net(dev), tb_id);
if (!table)
return NULL;
rcu_read_lock();
fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true);
if (!fn)
goto out;
for_each_fib6_node_rt_rcu(fn) {
/* prefix routes only use builtin fib6_nh */
if (rt->nh)
continue;
if (rt->fib6_nh->fib_nh_dev->ifindex != dev->ifindex)
continue;
if (no_gw && rt->fib6_nh->fib_nh_gw_family)
continue;
if ((rt->fib6_flags & flags) != flags)
continue;
if ((rt->fib6_flags & noflags) != 0)
continue;
if (!fib6_info_hold_safe(rt))
continue;
break;
}
out:
rcu_read_unlock();
return rt;
}
/* Create "default" multicast route to the interface */
static void addrconf_add_mroute(struct net_device *dev)
{
struct fib6_config cfg = {
.fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
.fc_metric = IP6_RT_PRIO_ADDRCONF,
.fc_ifindex = dev->ifindex,
.fc_dst_len = 8,
.fc_flags = RTF_UP,
.fc_type = RTN_MULTICAST,
.fc_nlinfo.nl_net = dev_net(dev),
.fc_protocol = RTPROT_KERNEL,
};
ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
ip6_route_add(&cfg, GFP_KERNEL, NULL);
}
static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
{
struct inet6_dev *idev;
ASSERT_RTNL();
idev = ipv6_find_idev(dev);
if (IS_ERR(idev))
return idev;
if (idev->cnf.disable_ipv6)
return ERR_PTR(-EACCES);
/* Add default multicast route */
if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
addrconf_add_mroute(dev);
return idev;
}
static void manage_tempaddrs(struct inet6_dev *idev,
struct inet6_ifaddr *ifp,
__u32 valid_lft, __u32 prefered_lft,
bool create, unsigned long now)
{
u32 flags;
struct inet6_ifaddr *ift;
read_lock_bh(&idev->lock);
/* update all temporary addresses in the list */
list_for_each_entry(ift, &idev->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 = idev->cnf.temp_valid_lft - age;
if (max_valid < 0)
max_valid = 0;
max_prefered = idev->cnf.temp_prefered_lft -
idev->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(&idev->tempaddr_list)) &&
idev->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(&idev->lock);
ipv6_create_tempaddr(ifp, false);
} else {
read_unlock_bh(&idev->lock);
}
}
static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
{
return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
}
int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
const struct prefix_info *pinfo,
struct inet6_dev *in6_dev,
const struct in6_addr *addr, int addr_type,
u32 addr_flags, bool sllao, bool tokenized,
__u32 valid_lft, u32 prefered_lft)
{
struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
int create = 0;
if (!ifp && valid_lft) {
int max_addresses = in6_dev->cnf.max_addresses;
struct ifa6_config cfg = {
.pfx = addr,
.plen = pinfo->prefix_len,
.ifa_flags = addr_flags,
.valid_lft = valid_lft,
.preferred_lft = prefered_lft,
.scope = addr_type & IPV6_ADDR_SCOPE_MASK,
};
#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
if ((net->ipv6.devconf_all->optimistic_dad ||
in6_dev->cnf.optimistic_dad) &&
!net->ipv6.devconf_all->forwarding && sllao)
cfg.ifa_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, &cfg, false, NULL);
if (IS_ERR_OR_NULL(ifp))
return -1;
create = 1;
spin_lock_bh(&ifp->lock);
ifp->flags |= IFA_F_MANAGETEMPADDR;
ifp->cstamp = jiffies;
ifp->tokenized = tokenized;
spin_unlock_bh(&ifp->lock);
addrconf_dad_start(ifp);
}
if (ifp) {
u32 flags;
unsigned long now;
u32 stored_lft;
/* Update lifetime (RFC4862 5.5.3 e)
* We deviate from RFC4862 by honoring all Valid Lifetimes to
* improve the reaction of SLAAC to renumbering events
* (draft-gont-6man-slaac-renum-06, Section 4.2)
*/
spin_lock_bh(&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 (!create && stored_lft) {
ifp->valid_lft = valid_lft;
ifp->prefered_lft = prefered_lft;
ifp->tstamp = now;
flags = ifp->flags;
ifp->flags &= ~IFA_F_DEPRECATED;
spin_unlock_bh(&ifp->lock);
if (!(flags&IFA_F_TENTATIVE))
ipv6_ifa_notify(0, ifp);
} else
spin_unlock_bh(&ifp->lock);
manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
create, now);
in6_ifa_put(ifp);
addrconf_verify();
}
return 0;
}
EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
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, err;
u32 addr_flags = 0;
struct inet6_dev *in6_dev;
struct net *net = dev_net(dev);
pinfo = (struct prefix_info *) opt;
if (len < sizeof(struct prefix_info)) {
netdev_dbg(dev, "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) {
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 fib6_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_DEFAULT, true);
if (rt) {
/* Autoconf prefix route */
if (valid_lft == 0) {
ip6_del_rt(net, rt, false);
rt = NULL;
} else if (addrconf_finite_timeout(rt_expires)) {
/* not infinity */
fib6_set_expires(rt, jiffies + rt_expires);
} else {
fib6_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,
0, dev, expires, flags,
GFP_ATOMIC);
}
fib6_info_release(rt);
}
/* Try to figure out our local address for this prefix */
if (pinfo->autoconf && in6_dev->cnf.autoconf) {
struct in6_addr addr;
bool tokenized = false, dev_addr_generated = false;
if (pinfo->prefix_len == 64) {
memcpy(&addr, &pinfo->prefix, 8);
if (!ipv6_addr_any(&in6_dev->token)) {
read_lock_bh(&in6_dev->lock);
memcpy(addr.s6_addr + 8,
in6_dev->token.s6_addr + 8, 8);
read_unlock_bh(&in6_dev->lock);
tokenized = true;
} else if (is_addr_mode_generate_stable(in6_dev) &&
!ipv6_generate_stable_address(&addr, 0,
in6_dev)) {
addr_flags |= IFA_F_STABLE_PRIVACY;
goto ok;
} else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
goto put;
} else {
dev_addr_generated = true;
}
goto ok;
}
net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
pinfo->prefix_len);
goto put;
ok:
err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
&addr, addr_type,
addr_flags, sllao,
tokenized, valid_lft,
prefered_lft);
if (err)
goto put;
/* Ignore error case here because previous prefix add addr was
* successful which will be notified.
*/
ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
addr_type, addr_flags, sllao,
tokenized, valid_lft,
prefered_lft,
dev_addr_generated);
}
inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
put:
in6_dev_put(in6_dev);
}
static int addrconf_set_sit_dstaddr(struct net *net, struct net_device *dev,
struct in6_ifreq *ireq)
{
struct ip_tunnel_parm p = { };
int err;
if (!(ipv6_addr_type(&ireq->ifr6_addr) & IPV6_ADDR_COMPATv4))
return -EADDRNOTAVAIL;
p.iph.daddr = ireq->ifr6_addr.s6_addr32[3];
p.iph.version = 4;
p.iph.ihl = 5;
p.iph.protocol = IPPROTO_IPV6;
p.iph.ttl = 64;
if (!dev->netdev_ops->ndo_tunnel_ctl)
return -EOPNOTSUPP;
err = dev->netdev_ops->ndo_tunnel_ctl(dev, &p, SIOCADDTUNNEL);
if (err)
return err;
dev = __dev_get_by_name(net, p.name);
if (!dev)
return -ENOBUFS;
return dev_open(dev, NULL);
}
/*
* 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 net_device *dev;
struct in6_ifreq ireq;
int err = -ENODEV;
if (!IS_ENABLED(CONFIG_IPV6_SIT))
return -ENODEV;
if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
return -EFAULT;
rtnl_lock();
dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
if (dev && dev->type == ARPHRD_SIT)
err = addrconf_set_sit_dstaddr(net, dev, &ireq);
rtnl_unlock();
return err;
}
static int ipv6_mc_config(struct sock *sk, bool join,
const struct in6_addr *addr, int ifindex)
{
int ret;
ASSERT_RTNL();
lock_sock(sk);
if (join)
ret = ipv6_sock_mc_join(sk, ifindex, addr);
else
ret = ipv6_sock_mc_drop(sk, ifindex, addr);
release_sock(sk);
return ret;
}
/*
* Manual configuration of address on an interface
*/
static int inet6_addr_add(struct net *net, int ifindex,
struct ifa6_config *cfg,
struct netlink_ext_ack *extack)
{
struct inet6_ifaddr *ifp;
struct inet6_dev *idev;
struct net_device *dev;
unsigned long timeout;
clock_t expires;
u32 flags;
ASSERT_RTNL();
if (cfg->plen > 128)
return -EINVAL;
/* check the lifetime */
if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
return -EINVAL;
if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64)
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);
if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
true, cfg->pfx, ifindex);
if (ret < 0)
return ret;
}
cfg->scope = ipv6_addr_scope(cfg->pfx);
timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
if (addrconf_finite_timeout(timeout)) {
expires = jiffies_to_clock_t(timeout * HZ);
cfg->valid_lft = timeout;
flags = RTF_EXPIRES;
} else {
expires = 0;
flags = 0;
cfg->ifa_flags |= IFA_F_PERMANENT;
}
timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
if (addrconf_finite_timeout(timeout)) {
if (timeout == 0)
cfg->ifa_flags |= IFA_F_DEPRECATED;
cfg->preferred_lft = timeout;
}
ifp = ipv6_add_addr(idev, cfg, true, extack);
if (!IS_ERR(ifp)) {
if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
ifp->rt_priority, dev, expires,
flags, GFP_KERNEL);
}
/* Send a netlink notification if DAD is enabled and
* optimistic flag is not set
*/
if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD)))
ipv6_ifa_notify(0, ifp);
/*
* 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);
if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR)
manage_tempaddrs(idev, ifp, cfg->valid_lft,
cfg->preferred_lft, true, jiffies);
in6_ifa_put(ifp);
addrconf_verify_rtnl();
return 0;
} else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
ipv6_mc_config(net->ipv6.mc_autojoin_sk, false,
cfg->pfx, ifindex);
}
return PTR_ERR(ifp);
}
static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
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;
idev = __in6_dev_get(dev);
if (!idev)
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);
if (!(ifp->flags & IFA_F_TEMPORARY) &&
(ifa_flags & IFA_F_MANAGETEMPADDR))
manage_tempaddrs(idev, ifp, 0, 0, false,
jiffies);
ipv6_del_addr(ifp);
addrconf_verify_rtnl();
if (ipv6_addr_is_multicast(pfx)) {
ipv6_mc_config(net->ipv6.mc_autojoin_sk,
false, pfx, dev->ifindex);
}
return 0;
}
}
read_unlock_bh(&idev->lock);
return -EADDRNOTAVAIL;
}
int addrconf_add_ifaddr(struct net *net, void __user *arg)
{
struct ifa6_config cfg = {
.ifa_flags = IFA_F_PERMANENT,
.preferred_lft = INFINITY_LIFE_TIME,
.valid_lft = INFINITY_LIFE_TIME,
};
struct in6_ifreq ireq;
int err;
if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
return -EPERM;
if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
return -EFAULT;
cfg.pfx = &ireq.ifr6_addr;
cfg.plen = ireq.ifr6_prefixlen;
rtnl_lock();
err = inet6_addr_add(net, ireq.ifr6_ifindex, &cfg, NULL);
rtnl_unlock();
return err;
}
int addrconf_del_ifaddr(struct net *net, void __user *arg)
{
struct in6_ifreq ireq;
int err;
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, 0, &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;
struct ifa6_config cfg = {
.pfx = addr,
.plen = plen,
.ifa_flags = IFA_F_PERMANENT,
.valid_lft = INFINITY_LIFE_TIME,
.preferred_lft = INFINITY_LIFE_TIME,
.scope = scope
};
ifp = ipv6_add_addr(idev, &cfg, true, NULL);
if (!IS_ERR(ifp)) {
spin_lock_bh(&ifp->lock);
ifp->flags &= ~IFA_F_TENTATIVE;
spin_unlock_bh(&ifp->lock);
rt_genid_bump_ipv6(dev_net(idev->dev));
ipv6_ifa_notify(RTM_NEWADDR, ifp);
in6_ifa_put(ifp);
}
}
#if IS_ENABLED(CONFIG_IPV6_SIT) || IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE)
static void add_v4_addrs(struct inet6_dev *idev)
{
struct in6_addr addr;
struct net_device *dev;
struct net *net = dev_net(idev->dev);
int scope, plen, offset = 0;
u32 pflags = 0;
ASSERT_RTNL();
memset(&addr, 0, sizeof(struct in6_addr));
/* in case of IP6GRE the dev_addr is an IPv6 and therefore we use only the last 4 bytes */
if (idev->dev->addr_len == sizeof(struct in6_addr))
offset = sizeof(struct in6_addr) - 4;
memcpy(&addr.s6_addr32[3], idev->dev->dev_addr + offset, 4);
if (idev->dev->flags&IFF_POINTOPOINT) {
if (idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_NONE)
return;
addr.s6_addr32[0] = htonl(0xfe800000);
scope = IFA_LINK;
plen = 64;
} else {
scope = IPV6_ADDR_COMPATv4;
plen = 96;
pflags |= RTF_NONEXTHOP;
}
if (addr.s6_addr32[3]) {
add_addr(idev, &addr, plen, scope);
addrconf_prefix_route(&addr, plen, 0, idev->dev, 0, pflags,
GFP_KERNEL);
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;
in_dev_for_each_ifa_rtnl(ifa, in_dev) {
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;
}
add_addr(idev, &addr, plen, flag);
addrconf_prefix_route(&addr, plen, 0, idev->dev,
0, pflags, GFP_KERNEL);
}
}
}
}
#endif
static void init_loopback(struct net_device *dev)
{
struct inet6_dev *idev;
/* ::1 */
ASSERT_RTNL();
idev = ipv6_find_idev(dev);
if (IS_ERR(idev)) {
pr_debug("%s: add_dev failed\n", __func__);
return;
}
add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
}
void addrconf_add_linklocal(struct inet6_dev *idev,
const struct in6_addr *addr, u32 flags)
{
struct ifa6_config cfg = {
.pfx = addr,
.plen = 64,
.ifa_flags = flags | IFA_F_PERMANENT,
.valid_lft = INFINITY_LIFE_TIME,
.preferred_lft = INFINITY_LIFE_TIME,
.scope = IFA_LINK
};
struct inet6_ifaddr *ifp;
#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad ||
idev->cnf.optimistic_dad) &&
!dev_net(idev->dev)->ipv6.devconf_all->forwarding)
cfg.ifa_flags |= IFA_F_OPTIMISTIC;
#endif
ifp = ipv6_add_addr(idev, &cfg, true, NULL);
if (!IS_ERR(ifp)) {
addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 0, idev->dev,
0, 0, GFP_ATOMIC);
addrconf_dad_start(ifp);
in6_ifa_put(ifp);
}
}
EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
static bool ipv6_reserved_interfaceid(struct in6_addr address)
{
if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
return true;
if (address.s6_addr32[2] == htonl(0x02005eff) &&
((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
return true;
if (address.s6_addr32[2] == htonl(0xfdffffff) &&
((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
return true;
return false;
}
static int ipv6_generate_stable_address(struct in6_addr *address,
u8 dad_count,
const struct inet6_dev *idev)
{
static DEFINE_SPINLOCK(lock);
static __u32 digest[SHA1_DIGEST_WORDS];
static __u32 workspace[SHA1_WORKSPACE_WORDS];
static union {
char __data[SHA1_BLOCK_SIZE];
struct {
struct in6_addr secret;
__be32 prefix[2];
unsigned char hwaddr[MAX_ADDR_LEN];
u8 dad_count;
} __packed;
} data;
struct in6_addr secret;
struct in6_addr temp;
struct net *net = dev_net(idev->dev);
BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
if (idev->cnf.stable_secret.initialized)
secret = idev->cnf.stable_secret.secret;
else if (net->ipv6.devconf_dflt->stable_secret.initialized)
secret = net->ipv6.devconf_dflt->stable_secret.secret;
else
return -1;
retry:
spin_lock_bh(&lock);
sha1_init(digest);
memset(&data, 0, sizeof(data));
memset(workspace, 0, sizeof(workspace));
memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
data.prefix[0] = address->s6_addr32[0];
data.prefix[1] = address->s6_addr32[1];
data.secret = secret;
data.dad_count = dad_count;
sha1_transform(digest, data.__data, workspace);
temp = *address;
temp.s6_addr32[2] = (__force __be32)digest[0];
temp.s6_addr32[3] = (__force __be32)digest[1];
spin_unlock_bh(&lock);
if (ipv6_reserved_interfaceid(temp)) {
dad_count++;
if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
return -1;
goto retry;
}
*address = temp;
return 0;
}
static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
{
struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
if (s->initialized)
return;
s = &idev->cnf.stable_secret;
get_random_bytes(&s->secret, sizeof(s->secret));
s->initialized = true;
}
static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
{
struct in6_addr addr;
/* no link local addresses on L3 master devices */
if (netif_is_l3_master(idev->dev))
return;
/* no link local addresses on devices flagged as slaves */
if (idev->dev->flags & IFF_SLAVE)
return;
ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
switch (idev->cnf.addr_gen_mode) {
case IN6_ADDR_GEN_MODE_RANDOM:
ipv6_gen_mode_random_init(idev);
fallthrough;
case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
if (!ipv6_generate_stable_address(&addr, 0, idev))
addrconf_add_linklocal(idev, &addr,
IFA_F_STABLE_PRIVACY);
else if (prefix_route)
addrconf_prefix_route(&addr, 64, 0, idev->dev,
0, 0, GFP_KERNEL);
break;
case IN6_ADDR_GEN_MODE_EUI64:
/* addrconf_add_linklocal also adds a prefix_route and we
* only need to care about prefix routes if ipv6_generate_eui64
* couldn't generate one.
*/
if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
addrconf_add_linklocal(idev, &addr, 0);
else if (prefix_route)
addrconf_prefix_route(&addr, 64, 0, idev->dev,
0, 0, GFP_KERNEL);
break;
case IN6_ADDR_GEN_MODE_NONE:
default:
/* will not add any link local address */
break;
}
}
static void addrconf_dev_config(struct net_device *dev)
{
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_IEEE1394) &&
(dev->type != ARPHRD_TUNNEL6) &&
(dev->type != ARPHRD_6LOWPAN) &&
(dev->type != ARPHRD_TUNNEL) &&
(dev->type != ARPHRD_NONE) &&
(dev->type != ARPHRD_RAWIP)) {
/* Alas, we support only Ethernet autoconfiguration. */
idev = __in6_dev_get(dev);
if (!IS_ERR_OR_NULL(idev) && dev->flags & IFF_UP &&
dev->flags & IFF_MULTICAST)
ipv6_mc_up(idev);
return;
}
idev = addrconf_add_dev(dev);
if (IS_ERR(idev))
return;
/* this device type has no EUI support */
if (dev->type == ARPHRD_NONE &&
idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
addrconf_addr_gen(idev, false);
}
#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
*/
idev = ipv6_find_idev(dev);
if (IS_ERR(idev)) {
pr_debug("%s: add_dev failed\n", __func__);
return;
}
if (dev->priv_flags & IFF_ISATAP) {
addrconf_addr_gen(idev, false);
return;
}
add_v4_addrs(idev);
if (dev->flags&IFF_POINTOPOINT)
addrconf_add_mroute(dev);
}
#endif
#if IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE)
static void addrconf_gre_config(struct net_device *dev)
{
struct inet6_dev *idev;
ASSERT_RTNL();
idev = ipv6_find_idev(dev);
if (IS_ERR(idev)) {
pr_debug("%s: add_dev failed\n", __func__);
return;
}
if (dev->type == ARPHRD_ETHER) {
addrconf_addr_gen(idev, true);
return;
}
add_v4_addrs(idev);
if (dev->flags & IFF_POINTOPOINT)
addrconf_add_mroute(dev);
}
#endif
static int fixup_permanent_addr(struct net *net,
struct inet6_dev *idev,
struct inet6_ifaddr *ifp)
{
/* !fib6_node means the host route was removed from the
* FIB, for example, if 'lo' device is taken down. In that
* case regenerate the host route.
*/
if (!ifp->rt || !ifp->rt->fib6_node) {
struct fib6_info *f6i, *prev;
f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false,
GFP_ATOMIC);
if (IS_ERR(f6i))
return PTR_ERR(f6i);
/* ifp->rt can be accessed outside of rtnl */
spin_lock(&ifp->lock);
prev = ifp->rt;
ifp->rt = f6i;
spin_unlock(&ifp->lock);
fib6_info_release(prev);
}
if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
ifp->rt_priority, idev->dev, 0, 0,
GFP_ATOMIC);
}
if (ifp->state == INET6_IFADDR_STATE_PREDAD)
addrconf_dad_start(ifp);
return 0;
}
static void addrconf_permanent_addr(struct net *net, struct net_device *dev)
{
struct inet6_ifaddr *ifp, *tmp;
struct inet6_dev *idev;
idev = __in6_dev_get(dev);
if (!idev)
return;
write_lock_bh(&idev->lock);
list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
if ((ifp->flags & IFA_F_PERMANENT) &&
fixup_permanent_addr(net, idev, ifp) < 0) {
write_unlock_bh(&idev->lock);
in6_ifa_hold(ifp);
ipv6_del_addr(ifp);
write_lock_bh(&idev->lock);
net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
idev->dev->name, &ifp->addr);
}
}
write_unlock_bh(&idev->lock);
}
static int addrconf_notify(struct notifier_block *this, unsigned long event,
void *ptr)
{
struct net_device *dev = netdev_notifier_info_to_dev(ptr);
struct netdev_notifier_change_info *change_info;
struct netdev_notifier_changeupper_info *info;
struct inet6_dev *idev = __in6_dev_get(dev);
struct net *net = dev_net(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 (IS_ERR(idev))
return notifier_from_errno(PTR_ERR(idev));
}
break;
case NETDEV_CHANGEMTU:
/* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
if (dev->mtu < IPV6_MIN_MTU) {
addrconf_ifdown(dev, dev != net->loopback_dev);
break;
}
if (idev) {
rt6_mtu_change(dev, dev->mtu);
idev->cnf.mtu6 = dev->mtu;
break;
}
/* allocate new idev */
idev = ipv6_add_dev(dev);
if (IS_ERR(idev))
break;
/* device is still not ready */
if (!(idev->if_flags & IF_READY))
break;
run_pending = 1;
fallthrough;
case NETDEV_UP:
case NETDEV_CHANGE:
if (dev->flags & IFF_SLAVE)
break;
if (idev && idev->cnf.disable_ipv6)
break;
if (event == NETDEV_UP) {
/* restore routes for permanent addresses */
addrconf_permanent_addr(net, dev);
if (!addrconf_link_ready(dev)) {
/* device is not ready yet. */
pr_debug("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
dev->name);
break;
}
if (!idev && dev->mtu >= IPV6_MIN_MTU)
idev = ipv6_add_dev(dev);
if (!IS_ERR_OR_NULL(idev)) {
idev->if_flags |= IF_READY;
run_pending = 1;
}
} else if (event == NETDEV_CHANGE) {
if (!addrconf_link_ready(dev)) {
/* device is still not ready. */
rt6_sync_down_dev(dev, event);
break;
}
if (!IS_ERR_OR_NULL(idev)) {
if (idev->if_flags & IF_READY) {
/* device is already configured -
* but resend MLD reports, we might
* have roamed and need to update
* multicast snooping switches
*/
ipv6_mc_up(idev);
change_info = ptr;
if (change_info->flags_changed & IFF_NOARP)
addrconf_dad_run(idev, true);
rt6_sync_up(dev, RTNH_F_LINKDOWN);
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) || IS_ENABLED(CONFIG_IPV6_GRE)
case ARPHRD_IP6GRE:
case ARPHRD_IPGRE:
addrconf_gre_config(dev);
break;
#endif
case ARPHRD_LOOPBACK:
init_loopback(dev);
break;
default:
addrconf_dev_config(dev);
break;
}
if (!IS_ERR_OR_NULL(idev)) {
if (run_pending)
addrconf_dad_run(idev, false);
/* Device has an address by now */
rt6_sync_up(dev, RTNH_F_DEAD);
/*
* 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, dev != net->loopback_dev);
}
break;
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);
err = addrconf_sysctl_register(idev);
if (err)
return notifier_from_errno(err);
err = snmp6_register_dev(idev);
if (err) {
addrconf_sysctl_unregister(idev);
return notifier_from_errno(err);
}
}
break;
case NETDEV_PRE_TYPE_CHANGE:
case NETDEV_POST_TYPE_CHANGE:
if (idev)
addrconf_type_change(dev, event);
break;
case NETDEV_CHANGEUPPER:
info = ptr;
/* flush all routes if dev is linked to or unlinked from
* an L3 master device (e.g., VRF)
*/
if (info->upper_dev && netif_is_l3_master(info->upper_dev))
addrconf_ifdown(dev, false);
}
return NOTIFY_OK;
}
/*
* addrconf module should be notified of a device going up
*/
static struct notifier_block ipv6_dev_notf = {
.notifier_call = addrconf_notify,
.priority = ADDRCONF_NOTIFY_PRIORITY,
};
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 bool addr_is_local(const struct in6_addr *addr)
{
return ipv6_addr_type(addr) &
(IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
}
static int addrconf_ifdown(struct net_device *dev, bool unregister)
{
unsigned long event = unregister ? NETDEV_UNREGISTER : NETDEV_DOWN;
struct net *net = dev_net(dev);
struct inet6_dev *idev;
struct inet6_ifaddr *ifa, *tmp;
bool keep_addr = false;
int state, i;
ASSERT_RTNL();
rt6_disable_ip(dev, event);
idev = __in6_dev_get(dev);
if (!idev)
return -ENODEV;
/*
* Step 1: remove reference to ipv6 device from parent device.
* Do not dev_put!
*/
if (unregister) {
idev->dead = 1;
/* protected by rtnl_lock */
RCU_INIT_POINTER(dev->ip6_ptr, NULL);
/* Step 1.5: remove snmp6 entry */
snmp6_unregister_dev(idev);
}
/* combine the user config with event to determine if permanent
* addresses are to be removed from address hash table
*/
if (!unregister && !idev->cnf.disable_ipv6) {
/* aggregate the system setting and interface setting */
int _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
if (!_keep_addr)
_keep_addr = idev->cnf.keep_addr_on_down;
keep_addr = (_keep_addr > 0);
}
/* Step 2: clear hash table */
for (i = 0; i < IN6_ADDR_HSIZE; i++) {
struct hlist_head *h = &inet6_addr_lst[i];
spin_lock_bh(&addrconf_hash_lock);
restart:
hlist_for_each_entry_rcu(ifa, h, addr_lst) {
if (ifa->idev == idev) {
addrconf_del_dad_work(ifa);
/* combined flag + permanent flag decide if
* address is retained on a down event
*/
if (!keep_addr ||
!(ifa->flags & IFA_F_PERMANENT) ||
addr_is_local(&ifa->addr)) {
hlist_del_init_rcu(&ifa->addr_lst);
goto restart;
}
}
}
spin_unlock_bh(&addrconf_hash_lock);
}
write_lock_bh(&idev->lock);
addrconf_del_rs_timer(idev);
/* Step 2: clear flags for stateless addrconf */
if (!unregister)
idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
/* 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);
}
list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) {
struct fib6_info *rt = NULL;
bool keep;
addrconf_del_dad_work(ifa);
keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
!addr_is_local(&ifa->addr);
write_unlock_bh(&idev->lock);
spin_lock_bh(&ifa->lock);
if (keep) {
/* set state to skip the notifier below */
state = INET6_IFADDR_STATE_DEAD;
ifa->state = INET6_IFADDR_STATE_PREDAD;
if (!(ifa->flags & IFA_F_NODAD))
ifa->flags |= IFA_F_TENTATIVE;
rt = ifa->rt;
ifa->rt = NULL;
} else {
state = ifa->state;
ifa->state = INET6_IFADDR_STATE_DEAD;
}
spin_unlock_bh(&ifa->lock);
if (rt)
ip6_del_rt(net, rt, false);
if (state != INET6_IFADDR_STATE_DEAD) {
__ipv6_ifa_notify(RTM_DELADDR, ifa);
inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
} else {
if (idev->cnf.forwarding)
addrconf_leave_anycast(ifa);
addrconf_leave_solict(ifa->idev, &ifa->addr);
}
write_lock_bh(&idev->lock);
if (!keep) {
list_del_rcu(&ifa->if_list);
in6_ifa_put(ifa);
}
}
write_unlock_bh(&idev->lock);
/* Step 5: Discard anycast and multicast list */
if (unregister) {
ipv6_ac_destroy_dev(idev);
ipv6_mc_destroy_dev(idev);
} else {
ipv6_mc_down(idev);
}
idev->tstamp = jiffies;
idev->ra_mtu = 0;
/* Last: Shot the device (if unregistered) */
if (unregister) {
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(struct timer_list *t)
{
struct inet6_dev *idev = from_timer(idev, t, rs_timer);
struct net_device *dev = idev->dev;
struct in6_addr lladdr;
write_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;
if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) {
write_unlock(&idev->lock);
if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
ndisc_send_rs(dev, &lladdr,
&in6addr_linklocal_allrouters);
else
goto put;
write_lock(&idev->lock);
idev->rs_interval = rfc3315_s14_backoff_update(
idev->rs_interval, idev->cnf.rtr_solicit_max_interval);
/* The wait after the last probe can be shorter */
addrconf_mod_rs_timer(idev, (idev->rs_probes ==
idev->cnf.rtr_solicits) ?
idev->cnf.rtr_solicit_delay :
idev->rs_interval);
} else {
/*
* Note: we do not support deprecated "all on-link"
* assumption any longer.
*/
pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
}
out:
write_unlock(&idev->lock);
put:
in6_dev_put(idev);
}
/*
* Duplicate Address Detection
*/
static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
{
unsigned long rand_num;
struct inet6_dev *idev = ifp->idev;
u64 nonce;
if (ifp->flags & IFA_F_OPTIMISTIC)
rand_num = 0;
else
rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
nonce = 0;
if (idev->cnf.enhanced_dad ||
dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) {
do
get_random_bytes(&nonce, 6);
while (nonce == 0);
}
ifp->dad_nonce = nonce;
ifp->dad_probes = idev->cnf.dad_transmits;
addrconf_mod_dad_work(ifp, rand_num);
}
static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
{
struct inet6_dev *idev = ifp->idev;
struct net_device *dev = idev->dev;
bool bump_id, notify = false;
struct net *net;
addrconf_join_solict(dev, &ifp->addr);
prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
read_lock_bh(&idev->lock);
spin_lock(&ifp->lock);
if (ifp->state == INET6_IFADDR_STATE_DEAD)
goto out;
net = dev_net(dev);
if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
(net->ipv6.devconf_all->accept_dad < 1 &&
idev->cnf.accept_dad < 1) ||
!(ifp->flags&IFA_F_TENTATIVE) ||
ifp->flags & IFA_F_NODAD) {
bool send_na = false;
if (ifp->flags & IFA_F_TENTATIVE &&
!(ifp->flags & IFA_F_OPTIMISTIC))
send_na = true;
bump_id = ifp->flags & IFA_F_TENTATIVE;
ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
spin_unlock(&ifp->lock);
read_unlock_bh(&idev->lock);
addrconf_dad_completed(ifp, bump_id, send_na);
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(net, ifp->rt);
if (ipv6_use_optimistic_addr(net, idev)) {
/* Because optimistic nodes can use this address,
* notify listeners. If DAD fails, RTM_DELADDR is sent.
*/
notify = true;
}
}
addrconf_dad_kick(ifp);
out:
spin_unlock(&ifp->lock);
read_unlock_bh(&idev->lock);
if (notify)
ipv6_ifa_notify(RTM_NEWADDR, ifp);
}
static void addrconf_dad_start(struct inet6_ifaddr *ifp)
{
bool begin_dad = false;
spin_lock_bh(&ifp->lock);
if (ifp->state != INET6_IFADDR_STATE_DEAD) {
ifp->state = INET6_IFADDR_STATE_PREDAD;
begin_dad = true;
}
spin_unlock_bh(&ifp->lock);
if (begin_dad)
addrconf_mod_dad_work(ifp, 0);
}
static void addrconf_dad_work(struct work_struct *w)
{
struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
struct inet6_ifaddr,
dad_work);
struct inet6_dev *idev = ifp->idev;
bool bump_id, disable_ipv6 = false;
struct in6_addr mcaddr;
enum {
DAD_PROCESS,
DAD_BEGIN,
DAD_ABORT,
} action = DAD_PROCESS;
rtnl_lock();
spin_lock_bh(&ifp->lock);
if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
action = DAD_BEGIN;
ifp->state = INET6_IFADDR_STATE_DAD;
} else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
action = DAD_ABORT;
ifp->state = INET6_IFADDR_STATE_POSTDAD;
if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 ||
idev->cnf.accept_dad > 1) &&
!idev->cnf.disable_ipv6 &&
!(ifp->flags & IFA_F_STABLE_PRIVACY)) {
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 */
idev->cnf.disable_ipv6 = 1;
pr_info("%s: IPv6 being disabled!\n",
ifp->idev->dev->name);
disable_ipv6 = true;
}
}
}
spin_unlock_bh(&ifp->lock);
if (action == DAD_BEGIN) {
addrconf_dad_begin(ifp);
goto out;
} else if (action == DAD_ABORT) {
in6_ifa_hold(ifp);
addrconf_dad_stop(ifp, 1);
if (disable_ipv6)
addrconf_ifdown(idev->dev, false);
goto out;
}
if (!ifp->dad_probes && addrconf_dad_end(ifp))
goto out;
write_lock_bh(&idev->lock);
if (idev->dead || !(idev->if_flags & IF_READY)) {
write_unlock_bh(&idev->lock);
goto out;
}
spin_lock(&ifp->lock);
if (ifp->state == INET6_IFADDR_STATE_DEAD) {
spin_unlock(&ifp->lock);
write_unlock_bh(&idev->lock);
goto out;
}
if (ifp->dad_probes == 0) {
bool send_na = false;
/*
* DAD was successful
*/
if (ifp->flags & IFA_F_TENTATIVE &&
!(ifp->flags & IFA_F_OPTIMISTIC))
send_na = true;
bump_id = ifp->flags & IFA_F_TENTATIVE;
ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
spin_unlock(&ifp->lock);
write_unlock_bh(&idev->lock);
addrconf_dad_completed(ifp, bump_id, send_na);
goto out;
}
ifp->dad_probes--;
addrconf_mod_dad_work(ifp,
max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME),
HZ/100));
spin_unlock(&ifp->lock);
write_unlock_bh(&idev->lock);
/* send a neighbour solicitation for our addr */
addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any,
ifp->dad_nonce);
out:
in6_ifa_put(ifp);
rtnl_unlock();
}
/* ifp->idev must be at least read locked */
static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
{
struct inet6_ifaddr *ifpiter;
struct inet6_dev *idev = ifp->idev;
list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
if (ifpiter->scope > IFA_LINK)
break;
if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
(ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
IFA_F_PERMANENT)
return false;
}
return true;
}
static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
bool send_na)
{
struct net_device *dev = ifp->idev->dev;
struct in6_addr lladdr;
bool send_rs, send_mld;
addrconf_del_dad_work(ifp);
/*
* Configure the address for reception. Now it is valid.
*/
ipv6_ifa_notify(RTM_NEWADDR, ifp);
/* If added prefix is link local and we are prepared to process
router advertisements, start sending router solicitations.
*/
read_lock_bh(&ifp->idev->lock);
send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
send_rs = send_mld &&
ipv6_accept_ra(ifp->idev) &&
ifp->idev->cnf.rtr_solicits != 0 &&
(dev->flags&IFF_LOOPBACK) == 0;
read_unlock_bh(&ifp->idev->lock);
/* While dad is in progress mld report's source address is in6_addrany.
* Resend with proper ll now.
*/
if (send_mld)
ipv6_mc_dad_complete(ifp->idev);
/* send unsolicited NA if enabled */
if (send_na &&
(ifp->idev->cnf.ndisc_notify ||
dev_net(dev)->ipv6.devconf_all->ndisc_notify)) {
ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr,
/*router=*/ !!ifp->idev->cnf.forwarding,
/*solicited=*/ false, /*override=*/ true,
/*inc_opt=*/ true);
}
if (send_rs) {
/*
* 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
*/
if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
return;
ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
write_lock_bh(&ifp->idev->lock);
spin_lock(&ifp->lock);
ifp->idev->rs_interval = rfc3315_s14_backoff_init(
ifp->idev->cnf.rtr_solicit_interval);
ifp->idev->rs_probes = 1;
ifp->idev->if_flags |= IF_RS_SENT;
addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
spin_unlock(&ifp->lock);
write_unlock_bh(&ifp->idev->lock);
}
if (bump_id)
rt_genid_bump_ipv6(dev_net(dev));
/* Make sure that a new temporary address will be created
* before this temporary address becomes deprecated.
*/
if (ifp->flags & IFA_F_TEMPORARY)
addrconf_verify_rtnl();
}
static void addrconf_dad_run(struct inet6_dev *idev, bool restart)
{
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) || restart) {
if (restart)
ifp->state = INET6_IFADDR_STATE_PREDAD;
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 if6_iter_state *state = seq->private;
struct net *net = seq_file_net(seq);
struct inet6_ifaddr *ifa = NULL;
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) {
hlist_for_each_entry_rcu(ifa, &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;
}
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);
hlist_for_each_entry_continue_rcu(ifa, addr_lst) {
if (!net_eq(dev_net(ifa->idev->dev), net))
continue;
state->offset++;
return ifa;
}
state->offset = 0;
while (++state->bucket < IN6_ADDR_HSIZE) {
hlist_for_each_entry_rcu(ifa,
&inet6_addr_lst[state->bucket], addr_lst) {
if (!net_eq(dev_net(ifa->idev->dev), net))
continue;
return ifa;
}
}
return NULL;
}
static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
__acquires(rcu)
{
rcu_read_lock();
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)
{
rcu_read_unlock();
}
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,
(u8) 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 __net_init if6_proc_net_init(struct net *net)
{
if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops,
sizeof(struct if6_iter_state)))
return -ENOMEM;
return 0;
}
static void __net_exit if6_proc_net_exit(struct net *net)
{
remove_proc_entry("if_inet6", net->proc_net);
}
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)
{
unsigned int hash = inet6_addr_hash(net, addr);
struct inet6_ifaddr *ifp = NULL;
int ret = 0;
rcu_read_lock();
hlist_for_each_entry_rcu(ifp, &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();
return ret;
}
#endif
/* RFC6554 has some algorithm to avoid loops in segment routing by
* checking if the segments contains any of a local interface address.
*
* Quote:
*
* To detect loops in the SRH, a router MUST determine if the SRH
* includes multiple addresses assigned to any interface on that router.
* If such addresses appear more than once and are separated by at least
* one address not assigned to that router.
*/
int ipv6_chk_rpl_srh_loop(struct net *net, const struct in6_addr *segs,
unsigned char nsegs)
{
const struct in6_addr *addr;
int i, ret = 0, found = 0;
struct inet6_ifaddr *ifp;
bool separated = false;
unsigned int hash;
bool hash_found;
rcu_read_lock();
for (i = 0; i < nsegs; i++) {
addr = &segs[i];
hash = inet6_addr_hash(net, addr);
hash_found = false;
hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
if (!net_eq(dev_net(ifp->idev->dev), net))
continue;
if (ipv6_addr_equal(&ifp->addr, addr)) {
hash_found = true;
break;
}
}
if (hash_found) {
if (found > 1 && separated) {
ret = 1;
break;
}
separated = false;
found++;
} else {
separated = true;
}
}
rcu_read_unlock();
return ret;
}
/*
* Periodic address status verification
*/
static void addrconf_verify_rtnl(void)
{
unsigned long now, next, next_sec, next_sched;
struct inet6_ifaddr *ifp;
int i;
ASSERT_RTNL();
rcu_read_lock_bh();
now = jiffies;
next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
cancel_delayed_work(&addr_chk_work);
for (i = 0; i < IN6_ADDR_HSIZE; i++) {
restart:
hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
unsigned long age;
/* When setting preferred_lft to a value not zero or
* infinity, while valid_lft is infinity
* IFA_F_PERMANENT has a non-infinity life time.
*/
if ((ifp->flags & IFA_F_PERMANENT) &&
(ifp->prefered_lft == INFINITY_LIFE_TIME))
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);
rcu_read_unlock_bh();
ipv6_del_addr(ifp);
rcu_read_lock_bh();
goto restart;
} else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
spin_unlock(&ifp->lock);
continue;
} else if (age >= ifp->prefered_lft) {
/* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
int deprecate = 0;
if (!(ifp->flags&IFA_F_DEPRECATED)) {
deprecate = 1;
ifp->flags |= IFA_F_DEPRECATED;
}
if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
(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;
}
} 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 *
max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME), HZ/100) / 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);
rcu_read_unlock_bh();
ipv6_create_tempaddr(ifpub, true);
in6_ifa_put(ifpub);
in6_ifa_put(ifp);
rcu_read_lock_bh();
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);
} 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;
pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
now, next, next_sec, next_sched);
mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
rcu_read_unlock_bh();
}
static void addrconf_verify_work(struct work_struct *w)
{
rtnl_lock();
addrconf_verify_rtnl();
rtnl_unlock();
}
static void addrconf_verify(void)
{
mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
}
static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
struct in6_addr **peer_pfx)
{
struct in6_addr *pfx = NULL;
*peer_pfx = NULL;
if (addr)
pfx = nla_data(addr);
if (local) {
if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
*peer_pfx = pfx;
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) },
[IFA_FLAGS] = { .len = sizeof(u32) },
[IFA_RT_PRIORITY] = { .len = sizeof(u32) },
[IFA_TARGET_NETNSID] = { .type = NLA_S32 },
};
static int
inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
struct netlink_ext_ack *extack)
{
struct net *net = sock_net(skb->sk);
struct ifaddrmsg *ifm;
struct nlattr *tb[IFA_MAX+1];
struct in6_addr *pfx, *peer_pfx;
u32 ifa_flags;
int err;
err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
ifa_ipv6_policy, extack);
if (err < 0)
return err;
ifm = nlmsg_data(nlh);
pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
if (!pfx)
return -EINVAL;
ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
/* We ignore other flags so far. */
ifa_flags &= IFA_F_MANAGETEMPADDR;
return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
ifm->ifa_prefixlen);
}
static int modify_prefix_route(struct inet6_ifaddr *ifp,
unsigned long expires, u32 flags,
bool modify_peer)
{
struct fib6_info *f6i;
u32 prio;
f6i = addrconf_get_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr,
ifp->prefix_len,
ifp->idev->dev, 0, RTF_DEFAULT, true);
if (!f6i)
return -ENOENT;
prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF;
if (f6i->fib6_metric != prio) {
/* delete old one */
ip6_del_rt(dev_net(ifp->idev->dev), f6i, false);
/* add new one */
addrconf_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr,
ifp->prefix_len,
ifp->rt_priority, ifp->idev->dev,
expires, flags, GFP_KERNEL);
} else {
if (!expires)
fib6_clean_expires(f6i);
else
fib6_set_expires(f6i, expires);
fib6_info_release(f6i);
}
return 0;
}
static int inet6_addr_modify(struct inet6_ifaddr *ifp, struct ifa6_config *cfg)
{
u32 flags;
clock_t expires;
unsigned long timeout;
bool was_managetempaddr;
bool had_prefixroute;
bool new_peer = false;
ASSERT_RTNL();
if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
return -EINVAL;
if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR &&
(ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
return -EINVAL;
if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED)
cfg->ifa_flags &= ~IFA_F_OPTIMISTIC;
timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
if (addrconf_finite_timeout(timeout)) {
expires = jiffies_to_clock_t(timeout * HZ);
cfg->valid_lft = timeout;
flags = RTF_EXPIRES;
} else {
expires = 0;
flags = 0;
cfg->ifa_flags |= IFA_F_PERMANENT;
}
timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
if (addrconf_finite_timeout(timeout)) {
if (timeout == 0)
cfg->ifa_flags |= IFA_F_DEPRECATED;
cfg->preferred_lft = timeout;
}
if (cfg->peer_pfx &&
memcmp(&ifp->peer_addr, cfg->peer_pfx, sizeof(struct in6_addr))) {
if (!ipv6_addr_any(&ifp->peer_addr))
cleanup_prefix_route(ifp, expires, true, true);
new_peer = true;
}
spin_lock_bh(&ifp->lock);
was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
!(ifp->flags & IFA_F_NOPREFIXROUTE);
ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
IFA_F_NOPREFIXROUTE);
ifp->flags |= cfg->ifa_flags;
ifp->tstamp = jiffies;
ifp->valid_lft = cfg->valid_lft;
ifp->prefered_lft = cfg->preferred_lft;
if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority)
ifp->rt_priority = cfg->rt_priority;
if (new_peer)
ifp->peer_addr = *cfg->peer_pfx;
spin_unlock_bh(&ifp->lock);
if (!(ifp->flags&IFA_F_TENTATIVE))
ipv6_ifa_notify(0, ifp);
if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
int rc = -ENOENT;
if (had_prefixroute)
rc = modify_prefix_route(ifp, expires, flags, false);
/* prefix route could have been deleted; if so restore it */
if (rc == -ENOENT) {
addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
ifp->rt_priority, ifp->idev->dev,
expires, flags, GFP_KERNEL);
}
if (had_prefixroute && !ipv6_addr_any(&ifp->peer_addr))
rc = modify_prefix_route(ifp, expires, flags, true);
if (rc == -ENOENT && !ipv6_addr_any(&ifp->peer_addr)) {
addrconf_prefix_route(&ifp->peer_addr, ifp->prefix_len,
ifp->rt_priority, ifp->idev->dev,
expires, flags, GFP_KERNEL);
}
} else if (had_prefixroute) {
enum cleanup_prefix_rt_t action;
unsigned long rt_expires;
write_lock_bh(&ifp->idev->lock);
action = check_cleanup_prefix_route(ifp, &rt_expires);
write_unlock_bh(&ifp->idev->lock);
if (action != CLEANUP_PREFIX_RT_NOP) {
cleanup_prefix_route(ifp, rt_expires,
action == CLEANUP_PREFIX_RT_DEL, false);
}
}
if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
if (was_managetempaddr &&
!(ifp->flags & IFA_F_MANAGETEMPADDR)) {
cfg->valid_lft = 0;
cfg->preferred_lft = 0;
}
manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft,
cfg->preferred_lft, !was_managetempaddr,
jiffies);
}
addrconf_verify_rtnl();
return 0;
}
static int
inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
struct netlink_ext_ack *extack)
{
struct net *net = sock_net(skb->sk);
struct ifaddrmsg *ifm;
struct nlattr *tb[IFA_MAX+1];
struct in6_addr *peer_pfx;
struct inet6_ifaddr *ifa;
struct net_device *dev;
struct inet6_dev *idev;
struct ifa6_config cfg;
int err;
err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
ifa_ipv6_policy, extack);
if (err < 0)
return err;
memset(&cfg, 0, sizeof(cfg));
ifm = nlmsg_data(nlh);
cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
if (!cfg.pfx)
return -EINVAL;
cfg.peer_pfx = peer_pfx;
cfg.plen = ifm->ifa_prefixlen;
if (tb[IFA_RT_PRIORITY])
cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]);
cfg.valid_lft = INFINITY_LIFE_TIME;
cfg.preferred_lft = INFINITY_LIFE_TIME;
if (tb[IFA_CACHEINFO]) {
struct ifa_cacheinfo *ci;
ci = nla_data(tb[IFA_CACHEINFO]);
cfg.valid_lft = ci->ifa_valid;
cfg.preferred_lft = ci->ifa_prefered;
}
dev = __dev_get_by_index(net, ifm->ifa_index);
if (!dev)
return -ENODEV;
if (tb[IFA_FLAGS])
cfg.ifa_flags = nla_get_u32(tb[IFA_FLAGS]);
else
cfg.ifa_flags = ifm->ifa_flags;
/* We ignore other flags so far. */
cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS |
IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE |
IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC;
idev = ipv6_find_idev(dev);
if (IS_ERR(idev))
return PTR_ERR(idev);
if (!ipv6_allow_optimistic_dad(net, idev))
cfg.ifa_flags &= ~IFA_F_OPTIMISTIC;
if (cfg.ifa_flags & IFA_F_NODAD &&
cfg.ifa_flags & IFA_F_OPTIMISTIC) {
NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive");
return -EINVAL;
}
ifa = ipv6_get_ifaddr(net, cfg.pfx, dev, 1);
if (!ifa) {
/*
* It would be best to check for !NLM_F_CREATE here but
* userspace already relies on not having to provide this.
*/
return inet6_addr_add(net, ifm->ifa_index, &cfg, extack);
}
if (nlh->nlmsg_flags & NLM_F_EXCL ||
!(nlh->nlmsg_flags & NLM_F_REPLACE))
err = -EEXIST;
else
err = inet6_addr_modify(ifa, &cfg);
in6_ifa_put(ifa);
return err;
}
static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 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_LOCAL */
+ nla_total_size(16) /* IFA_ADDRESS */
+ nla_total_size(sizeof(struct ifa_cacheinfo))
+ nla_total_size(4) /* IFA_FLAGS */
+ nla_total_size(4) /* IFA_RT_PRIORITY */;
}
enum addr_type_t {
UNICAST_ADDR,
MULTICAST_ADDR,
ANYCAST_ADDR,
};
struct inet6_fill_args {
u32 portid;
u32 seq;
int event;
unsigned int flags;
int netnsid;
int ifindex;
enum addr_type_t type;
};
static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
struct inet6_fill_args *args)
{
struct nlmsghdr *nlh;
u32 preferred, valid;
nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
sizeof(struct ifaddrmsg), args->flags);
if (!nlh)
return -EMSGSIZE;
put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
ifa->idev->dev->ifindex);
if (args->netnsid >= 0 &&
nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid))
goto error;
if (!((ifa->flags&IFA_F_PERMANENT) &&
(ifa->prefered_lft == INFINITY_LIFE_TIME))) {
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 (!ipv6_addr_any(&ifa->peer_addr)) {
if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
goto error;
} else
if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
goto error;
if (ifa->rt_priority &&
nla_put_u32(skb, IFA_RT_PRIORITY, ifa->rt_priority))
goto error;
if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
goto error;
if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
goto error;
nlmsg_end(skb, nlh);
return 0;
error:
nlmsg_cancel(skb, nlh);
return -EMSGSIZE;
}
static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
struct inet6_fill_args *args)
{
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, args->portid, args->seq, args->event,
sizeof(struct ifaddrmsg), args->flags);
if (!nlh)
return -EMSGSIZE;
if (args->netnsid >= 0 &&
nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) {
nlmsg_cancel(skb, nlh);
return -EMSGSIZE;
}
put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
if (nla_put_in6_addr(skb, IFA_MULTICAST, &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;
}
nlmsg_end(skb, nlh);
return 0;
}
static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
struct inet6_fill_args *args)
{
struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt);
int ifindex = dev ? dev->ifindex : 1;
struct nlmsghdr *nlh;
u8 scope = RT_SCOPE_UNIVERSE;
if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
scope = RT_SCOPE_SITE;
nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
sizeof(struct ifaddrmsg), args->flags);
if (!nlh)
return -EMSGSIZE;
if (args->netnsid >= 0 &&
nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) {
nlmsg_cancel(skb, nlh);
return -EMSGSIZE;
}
put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
if (nla_put_in6_addr(skb, IFA_ANYCAST, &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;
}
nlmsg_end(skb, nlh);
return 0;
}
/* called with rcu_read_lock() */
static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
struct netlink_callback *cb, int s_ip_idx,
struct inet6_fill_args *fillargs)
{
struct ifmcaddr6 *ifmca;
struct ifacaddr6 *ifaca;
int ip_idx = 0;
int err = 1;
read_lock_bh(&idev->lock);
switch (fillargs->type) {
case UNICAST_ADDR: {
struct inet6_ifaddr *ifa;
fillargs->event = RTM_NEWADDR;
/* unicast address incl. temp addr */
list_for_each_entry(ifa, &idev->addr_list, if_list) {
if (ip_idx < s_ip_idx)
goto next;
err = inet6_fill_ifaddr(skb, ifa, fillargs);
if (err < 0)
break;
nl_dump_check_consistent(cb, nlmsg_hdr(skb));
next:
ip_idx++;
}
break;
}
case MULTICAST_ADDR:
read_unlock_bh(&idev->lock);
fillargs->event = RTM_GETMULTICAST;
/* multicast address */
for (ifmca = rcu_dereference(idev->mc_list);
ifmca;
ifmca = rcu_dereference(ifmca->next), ip_idx++) {
if (ip_idx < s_ip_idx)
continue;
err = inet6_fill_ifmcaddr(skb, ifmca, fillargs);
if (err < 0)
break;
}
read_lock_bh(&idev->lock);
break;
case ANYCAST_ADDR:
fillargs->event = RTM_GETANYCAST;
/* 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, fillargs);
if (err < 0)
break;
}
break;
default:
break;
}
read_unlock_bh(&idev->lock);
cb->args[2] = ip_idx;
return err;
}
static int inet6_valid_dump_ifaddr_req(const struct nlmsghdr *nlh,
struct inet6_fill_args *fillargs,
struct net **tgt_net, struct sock *sk,
struct netlink_callback *cb)
{
struct netlink_ext_ack *extack = cb->extack;
struct nlattr *tb[IFA_MAX+1];
struct ifaddrmsg *ifm;
int err, i;
if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
NL_SET_ERR_MSG_MOD(extack, "Invalid header for address dump request");
return -EINVAL;
}
ifm = nlmsg_data(nlh);
if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for address dump request");
return -EINVAL;
}
fillargs->ifindex = ifm->ifa_index;
if (fillargs->ifindex) {
cb->answer_flags |= NLM_F_DUMP_FILTERED;
fillargs->flags |= NLM_F_DUMP_FILTERED;
}
err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
ifa_ipv6_policy, extack);
if (err < 0)
return err;
for (i = 0; i <= IFA_MAX; ++i) {
if (!tb[i])
continue;
if (i == IFA_TARGET_NETNSID) {
struct net *net;
fillargs->netnsid = nla_get_s32(tb[i]);
net = rtnl_get_net_ns_capable(sk, fillargs->netnsid);
if (IS_ERR(net)) {
fillargs->netnsid = -1;
NL_SET_ERR_MSG_MOD(extack, "Invalid target network namespace id");
return PTR_ERR(net);
}
*tgt_net = net;
} else {
NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request");
return -EINVAL;
}
}
return 0;
}
static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
enum addr_type_t type)
{
const struct nlmsghdr *nlh = cb->nlh;
struct inet6_fill_args fillargs = {
.portid = NETLINK_CB(cb->skb).portid,
.seq = cb->nlh->nlmsg_seq,
.flags = NLM_F_MULTI,
.netnsid = -1,
.type = type,
};
struct net *tgt_net = sock_net(skb->sk);
int idx, s_idx, s_ip_idx;
int h, s_h;
struct net_device *dev;
struct inet6_dev *idev;
struct hlist_head *head;
int err = 0;
s_h = cb->args[0];
s_idx = idx = cb->args[1];
s_ip_idx = cb->args[2];
if (cb->strict_check) {
err = inet6_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net,
skb->sk, cb);
if (err < 0)
goto put_tgt_net;
err = 0;
if (fillargs.ifindex) {
dev = __dev_get_by_index(tgt_net, fillargs.ifindex);
if (!dev) {
err = -ENODEV;
goto put_tgt_net;
}
idev = __in6_dev_get(dev);
if (idev) {
err = in6_dump_addrs(idev, skb, cb, s_ip_idx,
&fillargs);
if (err > 0)
err = 0;
}
goto put_tgt_net;
}
}
rcu_read_lock();
cb->seq = atomic_read(&tgt_net->ipv6.dev_addr_genid) ^ tgt_net->dev_base_seq;
for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
idx = 0;
head = &tgt_net->dev_index_head[h];
hlist_for_each_entry_rcu(dev, head, index_hlist) {
if (idx < s_idx)
goto cont;
if (h > s_h || idx > s_idx)
s_ip_idx = 0;
idev = __in6_dev_get(dev);
if (!idev)
goto cont;
if (in6_dump_addrs(idev, skb, cb, s_ip_idx,
&fillargs) < 0)
goto done;
cont:
idx++;
}
}
done:
rcu_read_unlock();
cb->args[0] = h;
cb->args[1] = idx;
put_tgt_net:
if (fillargs.netnsid >= 0)
put_net(tgt_net);
return skb->len ? : err;
}
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_valid_getaddr_req(struct sk_buff *skb,
const struct nlmsghdr *nlh,
struct nlattr **tb,
struct netlink_ext_ack *extack)
{
struct ifaddrmsg *ifm;
int i, err;
if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
NL_SET_ERR_MSG_MOD(extack, "Invalid header for get address request");
return -EINVAL;
}
if (!netlink_strict_get_check(skb))
return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
ifa_ipv6_policy, extack);
ifm = nlmsg_data(nlh);
if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get address request");
return -EINVAL;
}
err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
ifa_ipv6_policy, extack);
if (err)
return err;
for (i = 0; i <= IFA_MAX; i++) {
if (!tb[i])
continue;
switch (i) {
case IFA_TARGET_NETNSID:
case IFA_ADDRESS:
case IFA_LOCAL:
break;
default:
NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get address request");
return -EINVAL;
}
}
return 0;
}
static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
struct netlink_ext_ack *extack)
{
struct net *tgt_net = sock_net(in_skb->sk);
struct inet6_fill_args fillargs = {
.portid = NETLINK_CB(in_skb).portid,
.seq = nlh->nlmsg_seq,
.event = RTM_NEWADDR,
.flags = 0,
.netnsid = -1,
};
struct ifaddrmsg *ifm;
struct nlattr *tb[IFA_MAX+1];
struct in6_addr *addr = NULL, *peer;
struct net_device *dev = NULL;
struct inet6_ifaddr *ifa;
struct sk_buff *skb;
int err;
err = inet6_rtm_valid_getaddr_req(in_skb, nlh, tb, extack);
if (err < 0)
return err;
if (tb[IFA_TARGET_NETNSID]) {
fillargs.netnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]);
tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(in_skb).sk,
fillargs.netnsid);
if (IS_ERR(tgt_net))
return PTR_ERR(tgt_net);
}
addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
if (!addr)
return -EINVAL;
ifm = nlmsg_data(nlh);
if (ifm->ifa_index)
dev = dev_get_by_index(tgt_net, ifm->ifa_index);
ifa = ipv6_get_ifaddr(tgt_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, &fillargs);
if (err < 0) {
/* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
WARN_ON(err == -EMSGSIZE);
kfree_skb(skb);
goto errout_ifa;
}
err = rtnl_unicast(skb, tgt_net, NETLINK_CB(in_skb).portid);
errout_ifa:
in6_ifa_put(ifa);
errout:
dev_put(dev);
if (fillargs.netnsid >= 0)
put_net(tgt_net);
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);
struct inet6_fill_args fillargs = {
.portid = 0,
.seq = 0,
.event = event,
.flags = 0,
.netnsid = -1,
};
int err = -ENOBUFS;
skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
if (!skb)
goto errout;
err = inet6_fill_ifaddr(skb, ifa, &fillargs);
if (err < 0) {
/* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
WARN_ON(err == -EMSGSIZE);
kfree_skb(skb);
goto errout;
}
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_MAX_INTERVAL] =
jiffies_to_msecs(cnf->rtr_solicit_max_interval);
array[DEVCONF_RTR_SOLICIT_DELAY] =
jiffies_to_msecs(cnf->rtr_solicit_delay);
array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
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;
array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
array[DEVCONF_RA_DEFRTR_METRIC] = cnf->ra_defrtr_metric;
array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
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_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen;
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;
array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
#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;
array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
/* we omit DEVCONF_STABLE_SECRET for now */
array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled;
#ifdef CONFIG_IPV6_SEG6_HMAC
array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac;
#endif
array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad;
array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode;
array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy;
array[DEVCONF_NDISC_TCLASS] = cnf->ndisc_tclass;
array[DEVCONF_RPL_SEG_ENABLED] = cnf->rpl_seg_enabled;
array[DEVCONF_IOAM6_ENABLED] = cnf->ioam6_enabled;
array[DEVCONF_IOAM6_ID] = cnf->ioam6_id;
array[DEVCONF_IOAM6_ID_WIDE] = cnf->ioam6_id_wide;
array[DEVCONF_NDISC_EVICT_NOCARRIER] = cnf->ndisc_evict_nocarrier;
}
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 */
+ nla_total_size(sizeof(struct in6_addr)) /* IFLA_INET6_TOKEN */
+ nla_total_size(1) /* IFLA_INET6_ADDR_GEN_MODE */
+ nla_total_size(4) /* IFLA_INET6_RA_MTU */
+ 0;
}
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(1) /* IFLA_OPERSTATE */
+ nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
}
static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
int bytes)
{
int i;
int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
BUG_ON(pad < 0);
/* Use put_unaligned() because stats may not be aligned for u64. */
put_unaligned(ICMP6_MIB_MAX, &stats[0]);
for (i = 1; i < ICMP6_MIB_MAX; i++)
put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
memset(&stats[ICMP6_MIB_MAX], 0, pad);
}
static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
int bytes, size_t syncpoff)
{
int i, c;
u64 buff[IPSTATS_MIB_MAX];
int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
BUG_ON(pad < 0);
memset(buff, 0, sizeof(buff));
buff[0] = IPSTATS_MIB_MAX;
for_each_possible_cpu(c) {
for (i = 1; i < IPSTATS_MIB_MAX; i++)
buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
}
memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
memset(&stats[IPSTATS_MIB_MAX], 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, idev->stats.ipv6, bytes,
offsetof(struct ipstats_mib, syncp));
break;
case IFLA_INET6_ICMP6STATS:
__snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
break;
}
}
static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
u32 ext_filter_mask)
{
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(NEIGH_VAR(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)
goto nla_put_failure;
ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
/* XXX - MC not implemented */
if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
return 0;
nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
if (!nla)
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)
goto nla_put_failure;
snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
if (!nla)
goto nla_put_failure;
read_lock_bh(&idev->lock);
memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
read_unlock_bh(&idev->lock);
if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode))
goto nla_put_failure;
if (idev->ra_mtu &&
nla_put_u32(skb, IFLA_INET6_RA_MTU, idev->ra_mtu))
goto nla_put_failure;
return 0;
nla_put_failure:
return -EMSGSIZE;
}
static size_t inet6_get_link_af_size(const struct net_device *dev,
u32 ext_filter_mask)
{
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,
u32 ext_filter_mask)
{
struct inet6_dev *idev = __in6_dev_get(dev);
if (!idev)
return -ENODATA;
if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
return -EMSGSIZE;
return 0;
}
static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token,
struct netlink_ext_ack *extack)
{
struct inet6_ifaddr *ifp;
struct net_device *dev = idev->dev;
bool clear_token, update_rs = false;
struct in6_addr ll_addr;
ASSERT_RTNL();
if (!token)
return -EINVAL;
if (dev->flags & IFF_LOOPBACK) {
NL_SET_ERR_MSG_MOD(extack, "Device is loopback");
return -EINVAL;
}
if (dev->flags & IFF_NOARP) {
NL_SET_ERR_MSG_MOD(extack,
"Device does not do neighbour discovery");
return -EINVAL;
}
if (!ipv6_accept_ra(idev)) {
NL_SET_ERR_MSG_MOD(extack,
"Router advertisement is disabled on device");
return -EINVAL;
}
if (idev->cnf.rtr_solicits == 0) {
NL_SET_ERR_MSG(extack,
"Router solicitation is disabled on device");
return -EINVAL;
}
write_lock_bh(&idev->lock);
BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
write_unlock_bh(&idev->lock);
clear_token = ipv6_addr_any(token);
if (clear_token)
goto update_lft;
if (!idev->dead && (idev->if_flags & IF_READY) &&
!ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
IFA_F_OPTIMISTIC)) {
/* If we're not ready, then normal ifup will take care
* of this. Otherwise, we need to request our rs here.
*/
ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
update_rs = true;
}
update_lft:
write_lock_bh(&idev->lock);
if (update_rs) {
idev->if_flags |= IF_RS_SENT;
idev->rs_interval = rfc3315_s14_backoff_init(
idev->cnf.rtr_solicit_interval);
idev->rs_probes = 1;
addrconf_mod_rs_timer(idev, idev->rs_interval);
}
/* Well, that's kinda nasty ... */
list_for_each_entry(ifp, &idev->addr_list, if_list) {
spin_lock(&ifp->lock);
if (ifp->tokenized) {
ifp->valid_lft = 0;
ifp->prefered_lft = 0;
}
spin_unlock(&ifp->lock);
}
write_unlock_bh(&idev->lock);
inet6_ifinfo_notify(RTM_NEWLINK, idev);
addrconf_verify_rtnl();
return 0;
}
static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
[IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
[IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
[IFLA_INET6_RA_MTU] = { .type = NLA_REJECT,
.reject_message =
"IFLA_INET6_RA_MTU can not be set" },
};
static int check_addr_gen_mode(int mode)
{
if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
mode != IN6_ADDR_GEN_MODE_NONE &&
mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
mode != IN6_ADDR_GEN_MODE_RANDOM)
return -EINVAL;
return 1;
}
static int check_stable_privacy(struct inet6_dev *idev, struct net *net,
int mode)
{
if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
!idev->cnf.stable_secret.initialized &&
!net->ipv6.devconf_dflt->stable_secret.initialized)
return -EINVAL;
return 1;
}
static int inet6_validate_link_af(const struct net_device *dev,
const struct nlattr *nla,
struct netlink_ext_ack *extack)
{
struct nlattr *tb[IFLA_INET6_MAX + 1];
struct inet6_dev *idev = NULL;
int err;
if (dev) {
idev = __in6_dev_get(dev);
if (!idev)
return -EAFNOSUPPORT;
}
err = nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla,
inet6_af_policy, extack);
if (err)
return err;
if (!tb[IFLA_INET6_TOKEN] && !tb[IFLA_INET6_ADDR_GEN_MODE])
return -EINVAL;
if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
if (check_addr_gen_mode(mode) < 0)
return -EINVAL;
if (dev && check_stable_privacy(idev, dev_net(dev), mode) < 0)
return -EINVAL;
}
return 0;
}
static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla,
struct netlink_ext_ack *extack)
{
struct inet6_dev *idev = __in6_dev_get(dev);
struct nlattr *tb[IFLA_INET6_MAX + 1];
int err;
if (!idev)
return -EAFNOSUPPORT;
if (nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0)
return -EINVAL;
if (tb[IFLA_INET6_TOKEN]) {
err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]),
extack);
if (err)
return err;
}
if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
idev->cnf.addr_gen_mode = mode;
}
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)
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_get_iflink(dev) &&
nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
nla_put_u8(skb, IFLA_OPERSTATE,
netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
goto nla_put_failure;
protoinfo = nla_nest_start_noflag(skb, IFLA_PROTINFO);
if (!protoinfo)
goto nla_put_failure;
if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
goto nla_put_failure;
nla_nest_end(skb, protoinfo);
nlmsg_end(skb, nlh);
return 0;
nla_put_failure:
nlmsg_cancel(skb, nlh);
return -EMSGSIZE;
}
static int inet6_valid_dump_ifinfo(const struct nlmsghdr *nlh,
struct netlink_ext_ack *extack)
{
struct ifinfomsg *ifm;
if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
NL_SET_ERR_MSG_MOD(extack, "Invalid header for link dump request");
return -EINVAL;
}
if (nlmsg_attrlen(nlh, sizeof(*ifm))) {
NL_SET_ERR_MSG_MOD(extack, "Invalid data after header");
return -EINVAL;
}
ifm = nlmsg_data(nlh);
if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
ifm->ifi_change || ifm->ifi_index) {
NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for dump request");
return -EINVAL;
}
return 0;
}
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;
/* only requests using strict checking can pass data to
* influence the dump
*/
if (cb->strict_check) {
int err = inet6_valid_dump_ifinfo(cb->nlh, cb->extack);
if (err < 0)
return err;
}
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, 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)
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);
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)
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;
nlmsg_end(skb, nlh);
return 0;
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)
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;
}
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)
{
struct net *net = dev_net(ifp->idev->dev);
if (event)
ASSERT_RTNL();
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 the device was taken down in the middle of the DAD
* cycle there is a race where we could get here without a
* host route, so nothing to insert. That will be fixed when
* the device is brought up.
*/
if (ifp->rt && !rcu_access_pointer(ifp->rt->fib6_node)) {
ip6_ins_rt(net, ifp->rt);
} else if (!ifp->rt && (ifp->idev->dev->flags & IFF_UP)) {
pr_warn("BUG: Address %pI6c on device %s is missing its host route.\n",
&ifp->addr, ifp->idev->dev->name);
}
if (ifp->idev->cnf.forwarding)
addrconf_join_anycast(ifp);
if (!ipv6_addr_any(&ifp->peer_addr))
addrconf_prefix_route(&ifp->peer_addr, 128,
ifp->rt_priority, ifp->idev->dev,
0, 0, GFP_ATOMIC);
break;
case RTM_DELADDR:
if (ifp->idev->cnf.forwarding)
addrconf_leave_anycast(ifp);
addrconf_leave_solict(ifp->idev, &ifp->addr);
if (!ipv6_addr_any(&ifp->peer_addr)) {
struct fib6_info *rt;
rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
ifp->idev->dev, 0, 0,
false);
if (rt)
ip6_del_rt(net, rt, false);
}
if (ifp->rt) {
ip6_del_rt(net, ifp->rt, false);
ifp->rt = NULL;
}
rt_genid_bump_ipv6(net);
break;
}
atomic_inc(&net->ipv6.dev_addr_genid);
}
static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
{
if (likely(ifp->idev->dead == 0))
__ipv6_ifa_notify(event, ifp);
}
#ifdef CONFIG_SYSCTL
static int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
void *buffer, size_t *lenp, loff_t *ppos)
{
int *valp = ctl->data;
int val = *valp;
loff_t pos = *ppos;
struct 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 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
void *buffer, size_t *lenp, loff_t *ppos)
{
struct inet6_dev *idev = ctl->extra1;
int min_mtu = IPV6_MIN_MTU;
struct ctl_table lctl;
lctl = *ctl;
lctl.extra1 = &min_mtu;
lctl.extra2 = idev ? &idev->dev->mtu : NULL;
return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
}
static void dev_disable_change(struct inet6_dev *idev)
{
struct netdev_notifier_info info;
if (!idev || !idev->dev)
return;
netdev_notifier_info_init(&info, idev->dev);
if (idev->cnf.disable_ipv6)
addrconf_notify(NULL, NETDEV_DOWN, &info);
else
addrconf_notify(NULL, NETDEV_UP, &info);
}
static void addrconf_disable_change(struct net *net, __s32 newf)
{
struct net_device *dev;
struct inet6_dev *idev;
for_each_netdev(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);
}
}
}
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(struct ctl_table *ctl, int write,
void *buffer, size_t *lenp, loff_t *ppos)
{
int *valp = ctl->data;
int val = *valp;
loff_t pos = *ppos;
struct 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 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
void *buffer, size_t *lenp, loff_t *ppos)
{
int *valp = ctl->data;
int ret;
int old, new;
old = *valp;
ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
new = *valp;
if (write && old != new) {
struct net *net = ctl->extra2;
if (!rtnl_trylock())
return restart_syscall();
if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
NETCONFA_PROXY_NEIGH,
NETCONFA_IFINDEX_DEFAULT,
net->ipv6.devconf_dflt);
else if (valp == &net->ipv6.devconf_all->proxy_ndp)
inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
NETCONFA_PROXY_NEIGH,
NETCONFA_IFINDEX_ALL,
net->ipv6.devconf_all);
else {
struct inet6_dev *idev = ctl->extra1;
inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
NETCONFA_PROXY_NEIGH,
idev->dev->ifindex,
&idev->cnf);
}
rtnl_unlock();
}
return ret;
}
static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write,
void *buffer, size_t *lenp,
loff_t *ppos)
{
int ret = 0;
u32 new_val;
struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
struct net *net = (struct net *)ctl->extra2;
struct ctl_table tmp = {
.data = &new_val,
.maxlen = sizeof(new_val),
.mode = ctl->mode,
};
if (!rtnl_trylock())
return restart_syscall();
new_val = *((u32 *)ctl->data);
ret = proc_douintvec(&tmp, write, buffer, lenp, ppos);
if (ret != 0)
goto out;
if (write) {
if (check_addr_gen_mode(new_val) < 0) {
ret = -EINVAL;
goto out;
}
if (idev) {
if (check_stable_privacy(idev, net, new_val) < 0) {
ret = -EINVAL;
goto out;
}
if (idev->cnf.addr_gen_mode != new_val) {
idev->cnf.addr_gen_mode = new_val;
addrconf_dev_config(idev->dev);
}
} else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) {
struct net_device *dev;
net->ipv6.devconf_dflt->addr_gen_mode = new_val;
for_each_netdev(net, dev) {
idev = __in6_dev_get(dev);
if (idev &&
idev->cnf.addr_gen_mode != new_val) {
idev->cnf.addr_gen_mode = new_val;
addrconf_dev_config(idev->dev);
}
}
}
*((u32 *)ctl->data) = new_val;
}
out:
rtnl_unlock();
return ret;
}
static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
void *buffer, size_t *lenp,
loff_t *ppos)
{
int err;
struct in6_addr addr;
char str[IPV6_MAX_STRLEN];
struct ctl_table lctl = *ctl;
struct net *net = ctl->extra2;
struct ipv6_stable_secret *secret = ctl->data;
if (&net->ipv6.devconf_all->stable_secret == ctl->data)
return -EIO;
lctl.maxlen = IPV6_MAX_STRLEN;
lctl.data = str;
if (!rtnl_trylock())
return restart_syscall();
if (!write && !secret->initialized) {
err = -EIO;
goto out;
}
err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
if (err >= sizeof(str)) {
err = -EIO;
goto out;
}
err = proc_dostring(&lctl, write, buffer, lenp, ppos);
if (err || !write)
goto out;
if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
err = -EIO;
goto out;
}
secret->initialized = true;
secret->secret = addr;
if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
struct net_device *dev;
for_each_netdev(net, dev) {
struct inet6_dev *idev = __in6_dev_get(dev);
if (idev) {
idev->cnf.addr_gen_mode =
IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
}
}
} else {
struct inet6_dev *idev = ctl->extra1;
idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
}
out:
rtnl_unlock();
return err;
}
static
int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
int write, void *buffer,
size_t *lenp,
loff_t *ppos)
{
int *valp = ctl->data;
int val = *valp;
loff_t pos = *ppos;
struct ctl_table lctl;
int ret;
/* ctl->data points to idev->cnf.ignore_routes_when_linkdown
* 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_linkdown(ctl, valp, val);
if (ret)
*ppos = pos;
return ret;
}
static
void addrconf_set_nopolicy(struct rt6_info *rt, int action)
{
if (rt) {
if (action)
rt->dst.flags |= DST_NOPOLICY;
else
rt->dst.flags &= ~DST_NOPOLICY;
}
}
static
void addrconf_disable_policy_idev(struct inet6_dev *idev, int val)
{
struct inet6_ifaddr *ifa;
read_lock_bh(&idev->lock);
list_for_each_entry(ifa, &idev->addr_list, if_list) {
spin_lock(&ifa->lock);
if (ifa->rt) {
/* host routes only use builtin fib6_nh */
struct fib6_nh *nh = ifa->rt->fib6_nh;
int cpu;
rcu_read_lock();
ifa->rt->dst_nopolicy = val ? true : false;
if (nh->rt6i_pcpu) {
for_each_possible_cpu(cpu) {
struct rt6_info **rtp;
rtp = per_cpu_ptr(nh->rt6i_pcpu, cpu);
addrconf_set_nopolicy(*rtp, val);
}
}
rcu_read_unlock();
}
spin_unlock(&ifa->lock);
}
read_unlock_bh(&idev->lock);
}
static
int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val)
{
struct inet6_dev *idev;
struct net *net;
if (!rtnl_trylock())
return restart_syscall();
*valp = val;
net = (struct net *)ctl->extra2;
if (valp == &net->ipv6.devconf_dflt->disable_policy) {
rtnl_unlock();
return 0;
}
if (valp == &net->ipv6.devconf_all->disable_policy) {
struct net_device *dev;
for_each_netdev(net, dev) {
idev = __in6_dev_get(dev);
if (idev)
addrconf_disable_policy_idev(idev, val);
}
} else {
idev = (struct inet6_dev *)ctl->extra1;
addrconf_disable_policy_idev(idev, val);
}
rtnl_unlock();
return 0;
}
static int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write,
void *buffer, size_t *lenp, loff_t *ppos)
{
int *valp = ctl->data;
int val = *valp;
loff_t pos = *ppos;
struct ctl_table lctl;
int ret;
lctl = *ctl;
lctl.data = &val;
ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
if (write && (*valp != val))
ret = addrconf_disable_policy(ctl, valp, val);
if (ret)
*ppos = pos;
return ret;
}
static int minus_one = -1;
static const int two_five_five = 255;
static u32 ioam6_if_id_max = U16_MAX;
static const struct ctl_table addrconf_sysctl[] = {
{
.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_minmax,
.extra1 = (void *)SYSCTL_ONE,
.extra2 = (void *)&two_five_five,
},
{
.procname = "mtu",
.data = &ipv6_devconf.mtu6,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = addrconf_sysctl_mtu,
},
{
.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_minmax,
.extra1 = &minus_one,
},
{
.procname = "router_solicitation_interval",
.data = &ipv6_devconf.rtr_solicit_interval,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec_jiffies,
},
{
.procname = "router_solicitation_max_interval",
.data = &ipv6_devconf.rtr_solicit_max_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,
},
{
.procname = "mldv1_unsolicited_report_interval",
.data =
&ipv6_devconf.mldv1_unsolicited_report_interval,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec_ms_jiffies,
},
{
.procname = "mldv2_unsolicited_report_interval",
.data =
&ipv6_devconf.mldv2_unsolicited_report_interval,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec_ms_jiffies,
},
{
.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,
},
{
.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 = "ra_defrtr_metric",
.data = &ipv6_devconf.ra_defrtr_metric,
.maxlen = sizeof(u32),
.mode = 0644,
.proc_handler = proc_douintvec_minmax,
.extra1 = (void *)SYSCTL_ONE,
},
{
.procname = "accept_ra_min_hop_limit",
.data = &ipv6_devconf.accept_ra_min_hop_limit,
.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_min_plen",
.data = &ipv6_devconf.accept_ra_rt_info_min_plen,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec,
},
{
.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 = addrconf_sysctl_proxy_ndp,
},
{
.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,
},
{
.procname = "use_optimistic",
.data = &ipv6_devconf.use_optimistic,
.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
},
{
.procname = "suppress_frag_ndisc",
.data = &ipv6_devconf.suppress_frag_ndisc,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec
},
{
.procname = "accept_ra_from_local",
.data = &ipv6_devconf.accept_ra_from_local,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec,
},
{
.procname = "accept_ra_mtu",
.data = &ipv6_devconf.accept_ra_mtu,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec,
},
{
.procname = "stable_secret",
.data = &ipv6_devconf.stable_secret,
.maxlen = IPV6_MAX_STRLEN,
.mode = 0600,
.proc_handler = addrconf_sysctl_stable_secret,
},
{
.procname = "use_oif_addrs_only",
.data = &ipv6_devconf.use_oif_addrs_only,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec,
},
{
.procname = "ignore_routes_with_linkdown",
.data = &ipv6_devconf.ignore_routes_with_linkdown,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
},
{
.procname = "drop_unicast_in_l2_multicast",
.data = &ipv6_devconf.drop_unicast_in_l2_multicast,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec,
},
{
.procname = "drop_unsolicited_na",
.data = &ipv6_devconf.drop_unsolicited_na,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec,
},
{
.procname = "keep_addr_on_down",
.data = &ipv6_devconf.keep_addr_on_down,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec,
},
{
.procname = "seg6_enabled",
.data = &ipv6_devconf.seg6_enabled,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec,
},
#ifdef CONFIG_IPV6_SEG6_HMAC
{
.procname = "seg6_require_hmac",
.data = &ipv6_devconf.seg6_require_hmac,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec,
},
#endif
{
.procname = "enhanced_dad",
.data = &ipv6_devconf.enhanced_dad,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec,
},
{
.procname = "addr_gen_mode",
.data = &ipv6_devconf.addr_gen_mode,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = addrconf_sysctl_addr_gen_mode,
},
{
.procname = "disable_policy",
.data = &ipv6_devconf.disable_policy,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = addrconf_sysctl_disable_policy,
},
{
.procname = "ndisc_tclass",
.data = &ipv6_devconf.ndisc_tclass,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
.extra1 = (void *)SYSCTL_ZERO,
.extra2 = (void *)&two_five_five,
},
{
.procname = "rpl_seg_enabled",
.data = &ipv6_devconf.rpl_seg_enabled,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec,
},
{
.procname = "ioam6_enabled",
.data = &ipv6_devconf.ioam6_enabled,
.maxlen = sizeof(u8),
.mode = 0644,
.proc_handler = proc_dou8vec_minmax,
.extra1 = (void *)SYSCTL_ZERO,
.extra2 = (void *)SYSCTL_ONE,
},
{
.procname = "ioam6_id",
.data = &ipv6_devconf.ioam6_id,
.maxlen = sizeof(u32),
.mode = 0644,
.proc_handler = proc_douintvec_minmax,
.extra1 = (void *)SYSCTL_ZERO,
.extra2 = (void *)&ioam6_if_id_max,
},
{
.procname = "ioam6_id_wide",
.data = &ipv6_devconf.ioam6_id_wide,
.maxlen = sizeof(u32),
.mode = 0644,
.proc_handler = proc_douintvec,
},
{
.procname = "ndisc_evict_nocarrier",
.data = &ipv6_devconf.ndisc_evict_nocarrier,
.maxlen = sizeof(u8),
.mode = 0644,
.proc_handler = proc_dou8vec_minmax,
.extra1 = (void *)SYSCTL_ZERO,
.extra2 = (void *)SYSCTL_ONE,
},
{
/* sentinel */
}
};
static int __addrconf_sysctl_register(struct net *net, char *dev_name,
struct inet6_dev *idev, struct ipv6_devconf *p)
{
int i, ifindex;
struct ctl_table *table;
char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL);
if (!table)
goto out;
for (i = 0; table[i].data; i++) {
table[i].data += (char *)p - (char *)&ipv6_devconf;
/* If one of these is already set, then it is not safe to
* overwrite either of them: this makes proc_dointvec_minmax
* usable.
*/
if (!table[i].extra1 && !table[i].extra2) {
table[i].extra1 = idev; /* embedded; no ref */
table[i].extra2 = net;
}
}
snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
p->sysctl_header = register_net_sysctl(net, path, table);
if (!p->sysctl_header)
goto free;
if (!strcmp(dev_name, "all"))
ifindex = NETCONFA_IFINDEX_ALL;
else if (!strcmp(dev_name, "default"))
ifindex = NETCONFA_IFINDEX_DEFAULT;
else
ifindex = idev->dev->ifindex;
inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
ifindex, p);
return 0;
free:
kfree(table);
out:
return -ENOBUFS;
}
static void __addrconf_sysctl_unregister(struct net *net,
struct ipv6_devconf *p, int ifindex)
{
struct ctl_table *table;
if (!p->sysctl_header)
return;
table = p->sysctl_header->ctl_table_arg;
unregister_net_sysctl_table(p->sysctl_header);
p->sysctl_header = NULL;
kfree(table);
inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
}
static int addrconf_sysctl_register(struct inet6_dev *idev)
{
int err;
if (!sysctl_dev_name_is_allowed(idev->dev->name))
return -EINVAL;
err = neigh_sysctl_register(idev->dev, idev->nd_parms,
&ndisc_ifinfo_sysctl_change);
if (err)
return err;
err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
idev, &idev->cnf);
if (err)
neigh_sysctl_unregister(idev->nd_parms);
return err;
}
static void addrconf_sysctl_unregister(struct inet6_dev *idev)
{
__addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf,
idev->dev->ifindex);
neigh_sysctl_unregister(idev->nd_parms);
}
#endif
static int __net_init addrconf_init_net(struct net *net)
{
int err = -ENOMEM;
struct ipv6_devconf *all, *dflt;
all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
if (!all)
goto err_alloc_all;
dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
if (!dflt)
goto err_alloc_dflt;
if (IS_ENABLED(CONFIG_SYSCTL) &&
!net_eq(net, &init_net)) {
switch (sysctl_devconf_inherit_init_net) {
case 1: /* copy from init_net */
memcpy(all, init_net.ipv6.devconf_all,
sizeof(ipv6_devconf));
memcpy(dflt, init_net.ipv6.devconf_dflt,
sizeof(ipv6_devconf_dflt));
break;
case 3: /* copy from the current netns */
memcpy(all, current->nsproxy->net_ns->ipv6.devconf_all,
sizeof(ipv6_devconf));
memcpy(dflt,
current->nsproxy->net_ns->ipv6.devconf_dflt,
sizeof(ipv6_devconf_dflt));
break;
case 0:
case 2:
/* use compiled values */
break;
}
}
/* these will be inherited by all namespaces */
dflt->autoconf = ipv6_defaults.autoconf;
dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
dflt->stable_secret.initialized = false;
all->stable_secret.initialized = false;
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(net, all, NETCONFA_IFINDEX_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, net->ipv6.devconf_dflt,
NETCONFA_IFINDEX_DEFAULT);
__addrconf_sysctl_unregister(net, net->ipv6.devconf_all,
NETCONFA_IFINDEX_ALL);
#endif
kfree(net->ipv6.devconf_dflt);
kfree(net->ipv6.devconf_all);
}
static struct pernet_operations addrconf_ops = {
.init = addrconf_init_net,
.exit = addrconf_exit_net,
};
static struct rtnl_af_ops inet6_ops __read_mostly = {
.family = AF_INET6,
.fill_link_af = inet6_fill_link_af,
.get_link_af_size = inet6_get_link_af_size,
.validate_link_af = inet6_validate_link_af,
.set_link_af = inet6_set_link_af,
};
/*
* Init / cleanup code
*/
int __init addrconf_init(void)
{
struct inet6_dev *idev;
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;
addrconf_wq = create_workqueue("ipv6_addrconf");
if (!addrconf_wq) {
err = -ENOMEM;
goto out_nowq;
}
/* 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();
idev = ipv6_add_dev(init_net.loopback_dev);
rtnl_unlock();
if (IS_ERR(idev)) {
err = PTR_ERR(idev);
goto errlo;
}
ip6_route_init_special_entries();
for (i = 0; i < IN6_ADDR_HSIZE; i++)
INIT_HLIST_HEAD(&inet6_addr_lst[i]);
register_netdevice_notifier(&ipv6_dev_notf);
addrconf_verify();
rtnl_af_register(&inet6_ops);
err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK,
NULL, inet6_dump_ifinfo, 0);
if (err < 0)
goto errout;
err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR,
inet6_rtm_newaddr, NULL, 0);
if (err < 0)
goto errout;
err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR,
inet6_rtm_deladdr, NULL, 0);
if (err < 0)
goto errout;
err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR,
inet6_rtm_getaddr, inet6_dump_ifaddr,
RTNL_FLAG_DOIT_UNLOCKED);
if (err < 0)
goto errout;
err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST,
NULL, inet6_dump_ifmcaddr, 0);
if (err < 0)
goto errout;
err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST,
NULL, inet6_dump_ifacaddr, 0);
if (err < 0)
goto errout;
err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF,
inet6_netconf_get_devconf,
inet6_netconf_dump_devconf,
RTNL_FLAG_DOIT_UNLOCKED);
if (err < 0)
goto errout;
err = ipv6_addr_label_rtnl_register();
if (err < 0)
goto errout;
return 0;
errout:
rtnl_unregister_all(PF_INET6);
rtnl_af_unregister(&inet6_ops);
unregister_netdevice_notifier(&ipv6_dev_notf);
errlo:
destroy_workqueue(addrconf_wq);
out_nowq:
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_af_unregister(&inet6_ops);
rtnl_lock();
/* clean dev list */
for_each_netdev(&init_net, dev) {
if (__in6_dev_get(dev) == NULL)
continue;
addrconf_ifdown(dev, true);
}
addrconf_ifdown(init_net.loopback_dev, true);
/*
* 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);
cancel_delayed_work(&addr_chk_work);
rtnl_unlock();
destroy_workqueue(addrconf_wq);
}
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