Commit 9e551110 authored by Nicolas Dichtel's avatar Nicolas Dichtel Committed by David S. Miller
Browse files

rtnl/ipv4: 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 edc9e748

net/ipv4/devinet.c

+73 −2
Original line number Diff line number Diff line
@@ -1448,7 +1448,8 @@ static int inet_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;
@@ -1473,7 +1474,8 @@ static int inet_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,

			IPV4_DEVCONF(*devconf, FORWARDING)) < 0)

		goto nla_put_failure;
@@ -1510,6 +1512,73 @@ static void inet_netconf_notify_devconf(struct net *net, int type, int ifindex, 
		rtnl_set_sk_err(net, RTNLGRP_IPV4_NETCONF, err);

}



static const struct nla_policy devconf_ipv4_policy[NETCONFA_MAX+1] = {

	[NETCONFA_IFINDEX]	= { .len = sizeof(int) },

	[NETCONFA_FORWARDING]	= { .len = sizeof(int) },

};



static int inet_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 ipv4_devconf *devconf;

	struct in_device *in_dev;

	struct net_device *dev;

	int ifindex;

	int err;



	err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,

			  devconf_ipv4_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->ipv4.devconf_all;

		break;

	case NETCONFA_IFINDEX_DEFAULT:

		devconf = net->ipv4.devconf_dflt;

		break;

	default:

		dev = __dev_get_by_index(net, ifindex);

		if (dev == NULL)

			goto errout;

		in_dev = __in_dev_get_rtnl(dev);

		if (in_dev == NULL)

			goto errout;

		devconf = &in_dev->cnf;

		break;

	}



	err = -ENOBUFS;

	skb = nlmsg_new(inet_netconf_msgsize_devconf(-1), GFP_ATOMIC);

	if (skb == NULL)

		goto errout;



	err = inet_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 inet_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 devinet_copy_dflt_conf(struct net *net, int i)
@@ -1894,5 +1963,7 @@ void __init devinet_init(void) 
	rtnl_register(PF_INET, RTM_NEWADDR, inet_rtm_newaddr, NULL, NULL);

	rtnl_register(PF_INET, RTM_DELADDR, inet_rtm_deladdr, NULL, NULL);

	rtnl_register(PF_INET, RTM_GETADDR, NULL, inet_dump_ifaddr, NULL);

	rtnl_register(PF_INET, RTM_GETNETCONF, inet_netconf_get_devconf,

		      NULL, NULL);

}