ipv6: AF_INET6 link address family

IPv6 already exposes some address family data via netlink in the
IFLA_PROTINFO attribute if RTM_GETLINK request is sent with the
address family set to AF_INET6. We take over this format and
reuse all the code.

Signed-off-by: Thomas Graf <tgraf@infradead.org>
Cc: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index aaa3ca448d08c43592b5fdbefdd8750178ae62d7..470e7acb91dfec637eceaea6adc23b9fbd169b34 100644 (file)
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -3831,6 +3831,15 @@ static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
        array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
 }
 
+static inline size_t inet6_ifla6_size(void)
+{
+       return nla_total_size(4) /* IFLA_INET6_FLAGS */
+            + nla_total_size(sizeof(struct ifla_cacheinfo))
+            + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
+            + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
+            + nla_total_size(ICMP6_MIB_MAX * 8); /* IFLA_INET6_ICMP6STATS */
+}
+
 static inline size_t inet6_if_nlmsg_size(void)
 {
        return NLMSG_ALIGN(sizeof(struct ifinfomsg))
@@ -3838,13 +3847,7 @@ static inline size_t inet6_if_nlmsg_size(void)
               + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
               + nla_total_size(4) /* IFLA_MTU */
               + nla_total_size(4) /* IFLA_LINK */
-              + nla_total_size( /* IFLA_PROTINFO */
-                       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(inet6_ifla6_size()); /* IFLA_PROTINFO */
 }
 
 static inline void __snmp6_fill_stats(u64 *stats, void __percpu **mib,
@@ -3891,15 +3894,76 @@ static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
        }
 }
 
+static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
+{
+       struct nlattr *nla;
+       struct ifla_cacheinfo ci;
+
+       NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
+
+       ci.max_reasm_len = IPV6_MAXPLEN;
+       ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
+                   + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
+       ci.reachable_time = idev->nd_parms->reachable_time;
+       ci.retrans_time = idev->nd_parms->retrans_time;
+       NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
+
+       nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
+       if (nla == NULL)
+               goto nla_put_failure;
+       ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
+
+       /* XXX - MC not implemented */
+
+       nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
+       if (nla == NULL)
+               goto nla_put_failure;
+       snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
+
+       nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
+       if (nla == NULL)
+               goto nla_put_failure;
+       snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
+
+       return 0;
+
+nla_put_failure:
+       return -EMSGSIZE;
+}
+
+static size_t inet6_get_link_af_size(const struct net_device *dev)
+{
+       if (!__in6_dev_get(dev))
+               return 0;
+
+       return inet6_ifla6_size();
+}
+
+static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
+{
+       struct inet6_dev *idev = __in6_dev_get(dev);
+
+       if (!idev)
+               return -ENODATA;
+
+       if (inet6_fill_ifla6_attrs(skb, idev) < 0)
+               return -EMSGSIZE;
+
+       return 0;
+}
+
+static int inet6_parse_link_af(struct net_device *dev, const struct nlattr *nla)
+{
+       return -EOPNOTSUPP;
+}
+
 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
                             u32 pid, u32 seq, int event, unsigned int flags)
 {
        struct net_device *dev = idev->dev;
-       struct nlattr *nla;
        struct ifinfomsg *hdr;
        struct nlmsghdr *nlh;
        void *protoinfo;
-       struct ifla_cacheinfo ci;
 
        nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
        if (nlh == NULL)
@@ -3926,31 +3990,8 @@ static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
        if (protoinfo == NULL)
                goto nla_put_failure;
 
-       NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
-
-       ci.max_reasm_len = IPV6_MAXPLEN;
-       ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
-                   + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
-       ci.reachable_time = idev->nd_parms->reachable_time;
-       ci.retrans_time = idev->nd_parms->retrans_time;
-       NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
-
-       nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
-       if (nla == NULL)
-               goto nla_put_failure;
-       ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
-
-       /* XXX - MC not implemented */
-
-       nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
-       if (nla == NULL)
-               goto nla_put_failure;
-       snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
-
-       nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
-       if (nla == NULL)
+       if (inet6_fill_ifla6_attrs(skb, idev) < 0)
                goto nla_put_failure;
-       snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
 
        nla_nest_end(skb, protoinfo);
        return nlmsg_end(skb, nlh);
@@ -4621,6 +4662,13 @@ int unregister_inet6addr_notifier(struct notifier_block *nb)
 }
 EXPORT_SYMBOL(unregister_inet6addr_notifier);
 
+static struct rtnl_af_ops inet6_ops = {
+       .family           = AF_INET6,
+       .fill_link_af     = inet6_fill_link_af,
+       .get_link_af_size = inet6_get_link_af_size,
+       .parse_link_af    = inet6_parse_link_af,
+};
+
 /*
  *     Init / cleanup code
  */
@@ -4672,6 +4720,10 @@ int __init addrconf_init(void)
 
        addrconf_verify(0);
 
+       err = rtnl_af_register(&inet6_ops);
+       if (err < 0)
+               goto errout_af;
+
        err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
        if (err < 0)
                goto errout;
@@ -4687,6 +4739,8 @@ int __init addrconf_init(void)
 
        return 0;
 errout:
+       rtnl_af_unregister(&inet6_ops);
+errout_af:
        unregister_netdevice_notifier(&ipv6_dev_notf);
 errlo:
        unregister_pernet_subsys(&addrconf_ops);
@@ -4707,6 +4761,8 @@ void addrconf_cleanup(void)
 
        rtnl_lock();
 
+       __rtnl_af_unregister(&inet6_ops);
+
        /* clean dev list */
        for_each_netdev(&init_net, dev) {
                if (__in6_dev_get(dev) == NULL)