1 files changed, 162 insertions, 15 deletions

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 0424e4e27414..fab23db8ee73 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>
@@ -401,7 +402,7 @@ 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 +461,141 @@ 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);
+
+        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;
+
+        return nlmsg_end(skb, nlh);
+
+nla_put_failure:
+        nlmsg_cancel(skb, nlh);
+        return -EMSGSIZE;
+}
+
+static 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:
+        if (err < 0)
+                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 +607,7 @@ 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 +622,8 @@ 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 +656,10 @@ 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 +667,10 @@ 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 +699,7 @@ 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);
 }
@@ -805,7 +951,7 @@ 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 +1838,7 @@ 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
@@ -1752,7 +1898,7 @@ 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 +2027,7 @@ 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 +2249,7 @@ 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;
@@ -2315,7 +2460,7 @@ 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 +2579,7 @@ 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 +2616,7 @@ 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 +2746,12 @@ 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;
@@ -3194,7 +3339,7 @@ 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)
 {
@@ -4784,6 +4929,8 @@ 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();