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Diffstat (limited to 'net/ipv6/addrconf.c')
-rw-r--r--net/ipv6/addrconf.c229
1 files changed, 194 insertions, 35 deletions
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 0424e4e2741..420e5632638 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -81,6 +81,7 @@
#include <net/pkt_sched.h>
#include <linux/if_tunnel.h>
#include <linux/rtnetlink.h>
+#include <linux/netconf.h>
#ifdef CONFIG_IPV6_PRIVACY
#include <linux/random.h>
@@ -153,6 +154,11 @@ static void addrconf_type_change(struct net_device *dev,
unsigned long event);
static int addrconf_ifdown(struct net_device *dev, int how);
+static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
+ int plen,
+ const struct net_device *dev,
+ u32 flags, u32 noflags);
+
static void addrconf_dad_start(struct inet6_ifaddr *ifp);
static void addrconf_dad_timer(unsigned long data);
static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
@@ -249,12 +255,6 @@ static inline bool addrconf_qdisc_ok(const struct net_device *dev)
return !qdisc_tx_is_noop(dev);
}
-/* Check if a route is valid prefix route */
-static inline int addrconf_is_prefix_route(const struct rt6_info *rt)
-{
- return (rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0;
-}
-
static void addrconf_del_timer(struct inet6_ifaddr *ifp)
{
if (del_timer(&ifp->timer))
@@ -401,7 +401,7 @@ static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
ndev->cnf.accept_dad = -1;
-#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
+#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;
@@ -460,6 +460,149 @@ static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
return idev;
}
+static int inet6_netconf_msgsize_devconf(int type)
+{
+ int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
+ + nla_total_size(4); /* NETCONFA_IFINDEX */
+
+ /* type -1 is used for ALL */
+ if (type == -1 || type == NETCONFA_FORWARDING)
+ size += nla_total_size(4);
+#ifdef CONFIG_IPV6_MROUTE
+ if (type == -1 || type == NETCONFA_MC_FORWARDING)
+ size += nla_total_size(4);
+#endif
+
+ return size;
+}
+
+static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
+ struct ipv6_devconf *devconf, u32 portid,
+ u32 seq, int event, unsigned int flags,
+ int type)
+{
+ struct nlmsghdr *nlh;
+ struct netconfmsg *ncm;
+
+ nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
+ flags);
+ if (nlh == NULL)
+ return -EMSGSIZE;
+
+ ncm = nlmsg_data(nlh);
+ ncm->ncm_family = AF_INET6;
+
+ if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
+ goto nla_put_failure;
+
+ /* type -1 is used for ALL */
+ if ((type == -1 || type == NETCONFA_FORWARDING) &&
+ nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
+ goto nla_put_failure;
+#ifdef CONFIG_IPV6_MROUTE
+ if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
+ nla_put_s32(skb, NETCONFA_MC_FORWARDING,
+ devconf->mc_forwarding) < 0)
+ goto nla_put_failure;
+#endif
+ return nlmsg_end(skb, nlh);
+
+nla_put_failure:
+ nlmsg_cancel(skb, nlh);
+ return -EMSGSIZE;
+}
+
+void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
+ struct ipv6_devconf *devconf)
+{
+ struct sk_buff *skb;
+ int err = -ENOBUFS;
+
+ skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
+ if (skb == NULL)
+ goto errout;
+
+ err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
+ RTM_NEWNETCONF, 0, type);
+ if (err < 0) {
+ /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
+ WARN_ON(err == -EMSGSIZE);
+ kfree_skb(skb);
+ goto errout;
+ }
+ rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
+ return;
+errout:
+ rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
+}
+
+static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
+ [NETCONFA_IFINDEX] = { .len = sizeof(int) },
+ [NETCONFA_FORWARDING] = { .len = sizeof(int) },
+};
+
+static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
+ struct nlmsghdr *nlh,
+ void *arg)
+{
+ struct net *net = sock_net(in_skb->sk);
+ struct nlattr *tb[NETCONFA_MAX+1];
+ struct netconfmsg *ncm;
+ struct sk_buff *skb;
+ struct ipv6_devconf *devconf;
+ struct inet6_dev *in6_dev;
+ struct net_device *dev;
+ int ifindex;
+ int err;
+
+ err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
+ devconf_ipv6_policy);
+ if (err < 0)
+ goto errout;
+
+ err = EINVAL;
+ if (!tb[NETCONFA_IFINDEX])
+ goto errout;
+
+ ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
+ switch (ifindex) {
+ case NETCONFA_IFINDEX_ALL:
+ devconf = net->ipv6.devconf_all;
+ break;
+ case NETCONFA_IFINDEX_DEFAULT:
+ devconf = net->ipv6.devconf_dflt;
+ break;
+ default:
+ dev = __dev_get_by_index(net, ifindex);
+ if (dev == NULL)
+ goto errout;
+ in6_dev = __in6_dev_get(dev);
+ if (in6_dev == NULL)
+ goto errout;
+ devconf = &in6_dev->cnf;
+ break;
+ }
+
+ err = -ENOBUFS;
+ skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
+ if (skb == NULL)
+ goto errout;
+
+ err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
+ NETLINK_CB(in_skb).portid,
+ nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
+ -1);
+ if (err < 0) {
+ /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
+ WARN_ON(err == -EMSGSIZE);
+ kfree_skb(skb);
+ goto errout;
+ }
+ err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
+errout:
+ return err;
+}
+
#ifdef CONFIG_SYSCTL
static void dev_forward_change(struct inet6_dev *idev)
{
@@ -471,7 +614,7 @@ static void dev_forward_change(struct inet6_dev *idev)
dev = idev->dev;
if (idev->cnf.forwarding)
dev_disable_lro(dev);
- if (dev && (dev->flags & IFF_MULTICAST)) {
+ if (dev->flags & IFF_MULTICAST) {
if (idev->cnf.forwarding)
ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
else
@@ -486,6 +629,8 @@ static void dev_forward_change(struct inet6_dev *idev)
else
addrconf_leave_anycast(ifa);
}
+ inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
+ dev->ifindex, &idev->cnf);
}
@@ -518,6 +663,10 @@ static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
*p = newf;
if (p == &net->ipv6.devconf_dflt->forwarding) {
+ if ((!newf) ^ (!old))
+ inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
+ NETCONFA_IFINDEX_DEFAULT,
+ net->ipv6.devconf_dflt);
rtnl_unlock();
return 0;
}
@@ -525,6 +674,10 @@ static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
if (p == &net->ipv6.devconf_all->forwarding) {
net->ipv6.devconf_dflt->forwarding = newf;
addrconf_forward_change(net, newf);
+ if ((!newf) ^ (!old))
+ inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
+ NETCONFA_IFINDEX_ALL,
+ net->ipv6.devconf_all);
} else if ((!newf) ^ (!old))
dev_forward_change((struct inet6_dev *)table->extra1);
rtnl_unlock();
@@ -553,7 +706,7 @@ void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
pr_warn("Freeing alive inet6 address %p\n", ifp);
return;
}
- dst_release(&ifp->rt->dst);
+ ip6_rt_put(ifp->rt);
kfree_rcu(ifp, rcu);
}
@@ -787,17 +940,15 @@ static void ipv6_del_addr(struct inet6_ifaddr *ifp)
if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
struct in6_addr prefix;
struct rt6_info *rt;
- struct net *net = dev_net(ifp->idev->dev);
- struct flowi6 fl6 = {};
ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
- fl6.flowi6_oif = ifp->idev->dev->ifindex;
- fl6.daddr = prefix;
- rt = (struct rt6_info *)ip6_route_lookup(net, &fl6,
- RT6_LOOKUP_F_IFACE);
- if (rt != net->ipv6.ip6_null_entry &&
- addrconf_is_prefix_route(rt)) {
+ rt = addrconf_get_prefix_route(&prefix,
+ ifp->prefix_len,
+ ifp->idev->dev,
+ 0, RTF_GATEWAY | RTF_DEFAULT);
+
+ if (rt) {
if (onlink == 0) {
ip6_del_rt(rt);
rt = NULL;
@@ -805,7 +956,7 @@ static void ipv6_del_addr(struct inet6_ifaddr *ifp)
rt6_set_expires(rt, expires);
}
}
- dst_release(&rt->dst);
+ ip6_rt_put(rt);
}
/* clean up prefsrc entries */
@@ -1692,7 +1843,7 @@ addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
This thing is done here expecting that the whole
class of non-broadcast devices need not cloning.
*/
-#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
+#if IS_ENABLED(CONFIG_IPV6_SIT)
if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
cfg.fc_flags |= RTF_NONEXTHOP;
#endif
@@ -1723,7 +1874,7 @@ static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
continue;
if ((rt->rt6i_flags & flags) != flags)
continue;
- if ((noflags != 0) && ((rt->rt6i_flags & flags) != 0))
+ if ((rt->rt6i_flags & noflags) != 0)
continue;
dst_hold(&rt->dst);
break;
@@ -1752,7 +1903,7 @@ static void addrconf_add_mroute(struct net_device *dev)
ip6_route_add(&cfg);
}
-#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
+#if IS_ENABLED(CONFIG_IPV6_SIT)
static void sit_route_add(struct net_device *dev)
{
struct fib6_config cfg = {
@@ -1881,8 +2032,7 @@ void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
dev, expires, flags);
}
- if (rt)
- dst_release(&rt->dst);
+ ip6_rt_put(rt);
}
/* Try to figure out our local address for this prefix */
@@ -2104,7 +2254,7 @@ int addrconf_set_dstaddr(struct net *net, void __user *arg)
if (dev == NULL)
goto err_exit;
-#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
+#if IS_ENABLED(CONFIG_IPV6_SIT)
if (dev->type == ARPHRD_SIT) {
const struct net_device_ops *ops = dev->netdev_ops;
struct ifreq ifr;
@@ -2268,7 +2418,7 @@ int addrconf_add_ifaddr(struct net *net, void __user *arg)
struct in6_ifreq ireq;
int err;
- if (!capable(CAP_NET_ADMIN))
+ if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
return -EPERM;
if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
@@ -2287,7 +2437,7 @@ int addrconf_del_ifaddr(struct net *net, void __user *arg)
struct in6_ifreq ireq;
int err;
- if (!capable(CAP_NET_ADMIN))
+ if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
return -EPERM;
if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
@@ -2315,7 +2465,7 @@ static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
}
}
-#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
+#if IS_ENABLED(CONFIG_IPV6_SIT)
static void sit_add_v4_addrs(struct inet6_dev *idev)
{
struct in6_addr addr;
@@ -2434,7 +2584,7 @@ static void addrconf_dev_config(struct net_device *dev)
addrconf_add_linklocal(idev, &addr);
}
-#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
+#if IS_ENABLED(CONFIG_IPV6_SIT)
static void addrconf_sit_config(struct net_device *dev)
{
struct inet6_dev *idev;
@@ -2471,7 +2621,7 @@ static void addrconf_sit_config(struct net_device *dev)
}
#endif
-#if defined(CONFIG_NET_IPGRE) || defined(CONFIG_NET_IPGRE_MODULE)
+#if IS_ENABLED(CONFIG_NET_IPGRE)
static void addrconf_gre_config(struct net_device *dev)
{
struct inet6_dev *idev;
@@ -2601,12 +2751,12 @@ static int addrconf_notify(struct notifier_block *this, unsigned long event,
}
switch (dev->type) {
-#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
+#if IS_ENABLED(CONFIG_IPV6_SIT)
case ARPHRD_SIT:
addrconf_sit_config(dev);
break;
#endif
-#if defined(CONFIG_NET_IPGRE) || defined(CONFIG_NET_IPGRE_MODULE)
+#if IS_ENABLED(CONFIG_NET_IPGRE)
case ARPHRD_IPGRE:
addrconf_gre_config(dev);
break;
@@ -2843,7 +2993,7 @@ static void addrconf_rs_timer(unsigned long data)
if (idev->dead || !(idev->if_flags & IF_READY))
goto out;
- if (idev->cnf.forwarding)
+ if (!ipv6_accept_ra(idev))
goto out;
/* Announcement received after solicitation was sent */
@@ -3005,8 +3155,7 @@ static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
router advertisements, start sending router solicitations.
*/
- if (((ifp->idev->cnf.accept_ra == 1 && !ifp->idev->cnf.forwarding) ||
- ifp->idev->cnf.accept_ra == 2) &&
+ if (ipv6_accept_ra(ifp->idev) &&
ifp->idev->cnf.rtr_solicits > 0 &&
(dev->flags&IFF_LOOPBACK) == 0 &&
(ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
@@ -3194,7 +3343,7 @@ void if6_proc_exit(void)
}
#endif /* CONFIG_PROC_FS */
-#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
+#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)
{
@@ -3892,6 +4041,7 @@ static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
+ array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
}
static inline size_t inet6_ifla6_size(void)
@@ -4560,6 +4710,13 @@ static struct addrconf_sysctl_table
.proc_handler = proc_dointvec
},
{
+ .procname = "ndisc_notify",
+ .data = &ipv6_devconf.ndisc_notify,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec
+ },
+ {
/* sentinel */
}
},
@@ -4784,6 +4941,8 @@ int __init addrconf_init(void)
inet6_dump_ifmcaddr, NULL);
__rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
inet6_dump_ifacaddr, NULL);
+ __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
+ NULL, NULL);
ipv6_addr_label_rtnl_register();
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-03-26 19:25:25 +0000