rtnl/ipv6: add support of RTM_GETNETCONF
This message allows to get the devconf for an interface. Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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f3a1bfb11c
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76f8f6cb76
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@ -466,7 +466,8 @@ static int inet6_netconf_msgsize_devconf(int type)
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int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
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+ nla_total_size(4); /* NETCONFA_IFINDEX */
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if (type == NETCONFA_FORWARDING)
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/* type -1 is used for ALL */
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if (type == -1 || type == NETCONFA_FORWARDING)
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size += nla_total_size(4);
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return size;
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@ -491,7 +492,8 @@ static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
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if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
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goto nla_put_failure;
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if (type == NETCONFA_FORWARDING &&
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/* type -1 is used for ALL */
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if ((type == -1 || type == NETCONFA_FORWARDING) &&
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nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
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goto nla_put_failure;
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@ -527,6 +529,73 @@ errout:
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rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
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}
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static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
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[NETCONFA_IFINDEX] = { .len = sizeof(int) },
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[NETCONFA_FORWARDING] = { .len = sizeof(int) },
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};
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static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
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struct nlmsghdr *nlh,
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void *arg)
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{
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struct net *net = sock_net(in_skb->sk);
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struct nlattr *tb[NETCONFA_MAX+1];
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struct netconfmsg *ncm;
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struct sk_buff *skb;
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struct ipv6_devconf *devconf;
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struct inet6_dev *in6_dev;
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struct net_device *dev;
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int ifindex;
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int err;
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err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
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devconf_ipv6_policy);
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if (err < 0)
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goto errout;
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err = EINVAL;
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if (!tb[NETCONFA_IFINDEX])
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goto errout;
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ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
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switch (ifindex) {
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case NETCONFA_IFINDEX_ALL:
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devconf = net->ipv6.devconf_all;
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break;
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case NETCONFA_IFINDEX_DEFAULT:
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devconf = net->ipv6.devconf_dflt;
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break;
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default:
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dev = __dev_get_by_index(net, ifindex);
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if (dev == NULL)
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goto errout;
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in6_dev = __in6_dev_get(dev);
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if (in6_dev == NULL)
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goto errout;
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devconf = &in6_dev->cnf;
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break;
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}
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err = -ENOBUFS;
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skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
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if (skb == NULL)
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goto errout;
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err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
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NETLINK_CB(in_skb).portid,
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nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
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-1);
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if (err < 0) {
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/* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
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WARN_ON(err == -EMSGSIZE);
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kfree_skb(skb);
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goto errout;
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}
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err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
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errout:
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return err;
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}
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#ifdef CONFIG_SYSCTL
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static void dev_forward_change(struct inet6_dev *idev)
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{
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@ -4861,6 +4930,8 @@ int __init addrconf_init(void)
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inet6_dump_ifmcaddr, NULL);
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__rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
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inet6_dump_ifacaddr, NULL);
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__rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
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NULL, NULL);
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ipv6_addr_label_rtnl_register();
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