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| author | Nicolas Dichtel <nicolas.dichtel@6wind.com> | 2012-10-26 00:28:53 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2012-10-29 00:05:00 +0100 |
| commit | 9e5511106f99f293ad4a55e1d35c2e909c0c2e60 (patch) | |
| tree | 873b3999d0ace885fc85b7f8f4d545a06e555d60 /net/ipv4/devinet.c | |
| parent | rtnl/ipv4: use netconf msg to advertise forwarding status (diff) | |
| download | linux-9e5511106f99f293ad4a55e1d35c2e909c0c2e60.tar.xz linux-9e5511106f99f293ad4a55e1d35c2e909c0c2e60.zip | |
rtnl/ipv4: 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>
Diffstat (limited to 'net/ipv4/devinet.c')
| -rw-r--r-- | net/ipv4/devinet.c | 75 |
1 files changed, 73 insertions, 2 deletions
diff --git a/net/ipv4/devinet.c b/net/ipv4/devinet.c index 020fdd2e6e19..f8b1e0494d75 100644 --- a/net/ipv4/devinet.c +++ b/net/ipv4/devinet.c @@ -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 @@ errout: 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); } |