static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
{
struct ifinfomsg *ifm;
struct nlattr *tb[IFLA_MAX+1];
struct net_device *dev = NULL;
struct sk_buff *nskb;
char *iw_buf = NULL, *iw = NULL;
int iw_buf_len = 0;
int err;
err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
if (err < 0)
return err;
ifm = nlmsg_data(nlh);
if (ifm->ifi_index >= 0) {
dev = dev_get_by_index(ifm->ifi_index);
if (dev == NULL)
return -ENODEV;
} else
return -EINVAL;
#ifdef CONFIG_NET_WIRELESS_RTNETLINK
if (tb[IFLA_WIRELESS]) {
/* Call Wireless Extensions. We need to know the size before
* we can alloc. Various stuff checked in there... */
err = wireless_rtnetlink_get(dev, nla_data(tb[IFLA_WIRELESS]),
nla_len(tb[IFLA_WIRELESS]),
&iw_buf, &iw_buf_len);
if (err < 0)
goto errout;
iw += IW_EV_POINT_OFF;
}
#endif /* CONFIG_NET_WIRELESS_RTNETLINK */
nskb = nlmsg_new(if_nlmsg_size(iw_buf_len), GFP_KERNEL);
if (nskb == NULL) {
err = -ENOBUFS;
goto errout;
}
err = rtnl_fill_ifinfo(nskb, dev, iw, iw_buf_len, RTM_NEWLINK,
NETLINK_CB(skb).pid, nlh->nlmsg_seq, 0, 0);
if (err < 0) {
/* -EMSGSIZE implies BUG in if_nlmsg_size */
WARN_ON(err == -EMSGSIZE);
kfree_skb(nskb);
goto errout;
}
err = rtnl_unicast(nskb, NETLINK_CB(skb).pid);
errout:
kfree(iw_buf);
dev_put(dev);
return err;
}
void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change)
{
struct sk_buff *skb;
int err = -ENOBUFS;
skb = nlmsg_new(if_nlmsg_size(), GFP_KERNEL);
if (skb == NULL)
goto errout;
err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0);
if (err < 0) {
/* -EMSGSIZE implies BUG in if_nlmsg_size() */
WARN_ON(err == -EMSGSIZE);
kfree_skb(skb);
goto errout;
}
err = rtnl_notify(skb, 0, RTNLGRP_LINK, NULL, GFP_KERNEL);
errout:
if (err < 0)
rtnl_set_sk_err(RTNLGRP_LINK, err);
}
static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
{
struct ifinfomsg *ifm;
struct nlattr *tb[IFLA_MAX+1];
struct net_device *dev = NULL;
struct sk_buff *nskb;
int err;
err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
if (err < 0)
return err;
ifm = nlmsg_data(nlh);
if (ifm->ifi_index > 0) {
dev = dev_get_by_index(ifm->ifi_index);
if (dev == NULL)
return -ENODEV;
} else
return -EINVAL;
nskb = nlmsg_new(if_nlmsg_size(), GFP_KERNEL);
if (nskb == NULL) {
err = -ENOBUFS;
goto errout;
}
err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).pid,
nlh->nlmsg_seq, 0, 0);
if (err < 0) {
/* -EMSGSIZE implies BUG in if_nlmsg_size */
WARN_ON(err == -EMSGSIZE);
kfree_skb(nskb);
goto errout;
}
err = rtnl_unicast(nskb, NETLINK_CB(skb).pid);
errout:
dev_put(dev);
return err;
}