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Commit 76f8f6cb authored by Nicolas Dichtel's avatar Nicolas Dichtel Committed by David S. Miller
Browse files

rtnl/ipv6: add support of RTM_GETNETCONF 



This message allows to get the devconf for an interface.

Signed-off-by: default avatarNicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent f3a1bfb1

net/ipv6/addrconf.c

+73 −2
Original line number Diff line number Diff line
@@ -466,7 +466,8 @@ static int inet6_netconf_msgsize_devconf(int type) 
	int size =  NLMSG_ALIGN(sizeof(struct netconfmsg))

		    + nla_total_size(4);	/* NETCONFA_IFINDEX */



	if (type == NETCONFA_FORWARDING)

	/* type -1 is used for ALL */

	if (type == -1 || type == NETCONFA_FORWARDING)

		size += nla_total_size(4);



	return size;
@@ -491,7 +492,8 @@ static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex, 
	if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)

		goto nla_put_failure;



	if (type == NETCONFA_FORWARDING &&

	/* 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;
@@ -527,6 +529,73 @@ 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)

{
@@ -4861,6 +4930,8 @@ 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();