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ipv4: AF_INET link address family
Implements the AF_INET link address family exposing the per device configuration settings via netlink using the attribute IFLA_INET_CONF. The format of IFLA_INET_CONF differs depending on the direction the attribute is sent. The attribute sent by the kernel consists of a u32 array, basically a 1:1 copy of in_device->cnf.data[]. The attribute expected by the kernel must consist of a sequence of nested u32 attributes, each representing a change request, e.g. [IFLA_INET_CONF] = { [IPV4_DEVCONF_FORWARDING] = 1, [IPV4_DEVCONF_NOXFRM] = 0, } libnl userspace API documentation and example available from: http://www.infradead.org/~tgr/libnl/doc-git/group__link__inet.html Signed-off-by: Thomas Graf <tgraf@infradead.org> Signed-off-by: David S. Miller <davem@davemloft.net>
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2 changed files with 83 additions and 0 deletions
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@ -147,6 +147,14 @@ enum {
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#define IFLA_PAYLOAD(n) NLMSG_PAYLOAD(n,sizeof(struct ifinfomsg))
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#endif
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enum {
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IFLA_INET_UNSPEC,
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IFLA_INET_CONF,
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__IFLA_INET_MAX,
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};
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#define IFLA_INET_MAX (__IFLA_INET_MAX - 1)
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/* ifi_flags.
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IFF_* flags.
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@ -1256,6 +1256,72 @@ static void rtmsg_ifa(int event, struct in_ifaddr *ifa, struct nlmsghdr *nlh,
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rtnl_set_sk_err(net, RTNLGRP_IPV4_IFADDR, err);
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}
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static size_t inet_get_link_af_size(const struct net_device *dev)
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{
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struct in_device *in_dev = __in_dev_get_rcu(dev);
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if (!in_dev)
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return 0;
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return nla_total_size(IPV4_DEVCONF_MAX * 4); /* IFLA_INET_CONF */
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}
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static int inet_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
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{
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struct in_device *in_dev = __in_dev_get_rcu(dev);
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struct nlattr *nla;
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int i;
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if (!in_dev)
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return -ENODATA;
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nla = nla_reserve(skb, IFLA_INET_CONF, IPV4_DEVCONF_MAX * 4);
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if (nla == NULL)
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return -EMSGSIZE;
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for (i = 0; i < IPV4_DEVCONF_MAX; i++)
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((u32 *) nla_data(nla))[i] = in_dev->cnf.data[i];
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return 0;
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}
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static const struct nla_policy inet_af_policy[IFLA_INET_MAX+1] = {
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[IFLA_INET_CONF] = { .type = NLA_NESTED },
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};
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static int inet_parse_link_af(struct net_device *dev, const struct nlattr *nla)
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{
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struct in_device *in_dev = __in_dev_get_rcu(dev);
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struct nlattr *a, *tb[IFLA_INET_MAX+1];
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int err, rem;
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if (!in_dev)
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return -EOPNOTSUPP;
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err = nla_parse_nested(tb, IFLA_INET_MAX, nla, inet_af_policy);
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if (err < 0)
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return err;
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if (tb[IFLA_INET_CONF]) {
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nla_for_each_nested(a, tb[IFLA_INET_CONF], rem) {
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int cfgid = nla_type(a);
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if (nla_len(a) < 4)
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return -EINVAL;
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if (cfgid <= 0 || cfgid > IPV4_DEVCONF_MAX)
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return -EINVAL;
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}
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}
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if (tb[IFLA_INET_CONF]) {
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nla_for_each_nested(a, tb[IFLA_INET_CONF], rem)
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ipv4_devconf_set(in_dev, nla_type(a), nla_get_u32(a));
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}
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return 0;
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}
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#ifdef CONFIG_SYSCTL
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static void devinet_copy_dflt_conf(struct net *net, int i)
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@ -1619,6 +1685,13 @@ static __net_initdata struct pernet_operations devinet_ops = {
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.exit = devinet_exit_net,
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};
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static struct rtnl_af_ops inet_af_ops = {
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.family = AF_INET,
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.fill_link_af = inet_fill_link_af,
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.get_link_af_size = inet_get_link_af_size,
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.parse_link_af = inet_parse_link_af,
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};
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void __init devinet_init(void)
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{
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register_pernet_subsys(&devinet_ops);
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@ -1626,6 +1699,8 @@ void __init devinet_init(void)
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register_gifconf(PF_INET, inet_gifconf);
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register_netdevice_notifier(&ip_netdev_notifier);
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rtnl_af_register(&inet_af_ops);
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rtnl_register(PF_INET, RTM_NEWADDR, inet_rtm_newaddr, NULL);
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rtnl_register(PF_INET, RTM_DELADDR, inet_rtm_deladdr, NULL);
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rtnl_register(PF_INET, RTM_GETADDR, NULL, inet_dump_ifaddr);
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