1 files changed, 165 insertions, 0 deletions

diff --git a/net/phonet/pn_netlink.c b/net/phonet/pn_netlink.c
new file mode 100644
index 000000000000..b1770d66bc8d
--- /dev/null
+++ b/net/phonet/pn_netlink.c
@@ -0,0 +1,165 @@
+/*
+ * File: pn_netlink.c
+ *
+ * Phonet netlink interface
+ *
+ * Copyright (C) 2008 Nokia Corporation.
+ *
+ * Contact: Remi Denis-Courmont <remi.denis-courmont@nokia.com>
+ * Original author: Sakari Ailus <sakari.ailus@nokia.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
+#include <linux/kernel.h>
+#include <linux/netlink.h>
+#include <linux/phonet.h>
+#include <net/sock.h>
+#include <net/phonet/pn_dev.h>
+
+static int fill_addr(struct sk_buff *skb, struct net_device *dev, u8 addr,
+                     u32 pid, u32 seq, int event);
+
+static void rtmsg_notify(int event, struct net_device *dev, u8 addr)
+{
+        struct sk_buff *skb;
+        int err = -ENOBUFS;
+
+        skb = nlmsg_new(NLMSG_ALIGN(sizeof(struct ifaddrmsg)) +
+                        nla_total_size(1), GFP_KERNEL);
+        if (skb == NULL)
+                goto errout;
+        err = fill_addr(skb, dev, addr, 0, 0, event);
+        if (err < 0) {
+                WARN_ON(err == -EMSGSIZE);
+                kfree_skb(skb);
+                goto errout;
+        }
+        err = rtnl_notify(skb, dev_net(dev), 0,
+                          RTNLGRP_PHONET_IFADDR, NULL, GFP_KERNEL);
+errout:
+        if (err < 0)
+                rtnl_set_sk_err(dev_net(dev), RTNLGRP_PHONET_IFADDR, err);
+}
+
+static const struct nla_policy ifa_phonet_policy[IFA_MAX+1] = {
+        [IFA_LOCAL] = { .type = NLA_U8 },
+};
+
+static int addr_doit(struct sk_buff *skb, struct nlmsghdr *nlh, void *attr)
+{
+        struct net *net = sock_net(skb->sk);
+        struct nlattr *tb[IFA_MAX+1];
+        struct net_device *dev;
+        struct ifaddrmsg *ifm;
+        int err;
+        u8 pnaddr;
+
+        if (!capable(CAP_SYS_ADMIN))
+                return -EPERM;
+
+        ASSERT_RTNL();
+
+        err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_phonet_policy);
+        if (err < 0)
+                return err;
+
+        ifm = nlmsg_data(nlh);
+        if (tb[IFA_LOCAL] == NULL)
+                return -EINVAL;
+        pnaddr = nla_get_u8(tb[IFA_LOCAL]);
+        if (pnaddr & 3)
+                /* Phonet addresses only have 6 high-order bits */
+                return -EINVAL;
+
+        dev = __dev_get_by_index(net, ifm->ifa_index);
+        if (dev == NULL)
+                return -ENODEV;
+
+        if (nlh->nlmsg_type == RTM_NEWADDR)
+                err = phonet_address_add(dev, pnaddr);
+        else
+                err = phonet_address_del(dev, pnaddr);
+        if (!err)
+                rtmsg_notify(nlh->nlmsg_type, dev, pnaddr);
+        return err;
+}
+
+static int fill_addr(struct sk_buff *skb, struct net_device *dev, u8 addr,
+                        u32 pid, u32 seq, int event)
+{
+        struct ifaddrmsg *ifm;
+        struct nlmsghdr *nlh;
+
+        nlh = nlmsg_put(skb, pid, seq, event, sizeof(*ifm), 0);
+        if (nlh == NULL)
+                return -EMSGSIZE;
+
+        ifm = nlmsg_data(nlh);
+        ifm->ifa_family = AF_PHONET;
+        ifm->ifa_prefixlen = 0;
+        ifm->ifa_flags = IFA_F_PERMANENT;
+        ifm->ifa_scope = RT_SCOPE_LINK;
+        ifm->ifa_index = dev->ifindex;
+        NLA_PUT_U8(skb, IFA_LOCAL, addr);
+        return nlmsg_end(skb, nlh);
+
+nla_put_failure:
+        nlmsg_cancel(skb, nlh);
+        return -EMSGSIZE;
+}
+
+static int getaddr_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
+{
+        struct phonet_device *pnd;
+        int dev_idx = 0, dev_start_idx = cb->args[0];
+        int addr_idx = 0, addr_start_idx = cb->args[1];
+
+        spin_lock_bh(&pndevs.lock);
+        list_for_each_entry(pnd, &pndevs.list, list) {
+                u8 addr;
+
+                if (dev_idx > dev_start_idx)
+                        addr_start_idx = 0;
+                if (dev_idx++ < dev_start_idx)
+                        continue;
+
+                addr_idx = 0;
+                for (addr = find_first_bit(pnd->addrs, 64); addr < 64;
+                        addr = find_next_bit(pnd->addrs, 64, 1+addr)) {
+                        if (addr_idx++ < addr_start_idx)
+                                continue;
+
+                        if (fill_addr(skb, pnd->netdev, addr << 2,
+                                         NETLINK_CB(cb->skb).pid,
+                                        cb->nlh->nlmsg_seq, RTM_NEWADDR))
+                                goto out;
+                }
+        }
+
+out:
+        spin_unlock_bh(&pndevs.lock);
+        cb->args[0] = dev_idx;
+        cb->args[1] = addr_idx;
+
+        return skb->len;
+}
+
+void __init phonet_netlink_register(void)
+{
+        rtnl_register(PF_PHONET, RTM_NEWADDR, addr_doit, NULL);
+        rtnl_register(PF_PHONET, RTM_DELADDR, addr_doit, NULL);
+        rtnl_register(PF_PHONET, RTM_GETADDR, NULL, getaddr_dumpit);
+}