Phonet: Netlink interface

This provides support for configuring Phonet addresses, notifying
Phonet configuration changes, and dumping the configuration.

Signed-off-by: Remi Denis-Courmont <remi.denis-courmont@nokia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 188 insertions, 0 deletions

diff --git a/net/phonet/Makefile b/net/phonet/Makefile
index 980a3866c9a3..4143c3e1dfdc 100644
--- a/net/phonet/Makefile
+++ b/net/phonet/Makefile
@@ -2,4 +2,5 @@ obj-$(CONFIG_PHONET) += phonet.o
 
 phonet-objs := \
         pn_dev.o \
+        pn_netlink.o \
         af_phonet.o
diff --git a/net/phonet/af_phonet.c b/net/phonet/af_phonet.c
index a8ba6f177b29..5c729ba56939 100644
--- a/net/phonet/af_phonet.c
+++ b/net/phonet/af_phonet.c
@@ -203,6 +203,7 @@ static int __init phonet_init(void)
 
         phonet_device_init();
         dev_add_pack(&phonet_packet_type);
+        phonet_netlink_register();
         return 0;
 }
 
diff --git a/net/phonet/pn_netlink.c b/net/phonet/pn_netlink.c
new file mode 100644
index 000000000000..b1ea19a230dd
--- /dev/null
+++ b/net/phonet/pn_netlink.c
@@ -0,0 +1,186 @@
+/*
+ * 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 int newaddr_doit(struct sk_buff *skb, struct nlmsghdr *nlm, void *attr)
+{
+        struct rtattr **rta = attr;
+        struct ifaddrmsg *ifm = NLMSG_DATA(nlm);
+        struct net_device *dev;
+        int err;
+        u8 pnaddr;
+
+        if (!capable(CAP_SYS_ADMIN))
+                return -EPERM;
+
+        ASSERT_RTNL();
+
+        if (rta[IFA_LOCAL - 1] == NULL)
+                return -EINVAL;
+
+        dev = __dev_get_by_index(&init_net, ifm->ifa_index);
+        if (dev == NULL)
+                return -ENODEV;
+
+        if (ifm->ifa_prefixlen > 0)
+                return -EINVAL;
+
+        memcpy(&pnaddr, RTA_DATA(rta[IFA_LOCAL - 1]), 1);
+
+        err = phonet_address_add(dev, pnaddr);
+        if (!err)
+                rtmsg_notify(RTM_NEWADDR, dev, pnaddr);
+        return err;
+}
+
+static int deladdr_doit(struct sk_buff *skb, struct nlmsghdr *nlm, void *attr)
+{
+        struct rtattr **rta = attr;
+        struct ifaddrmsg *ifm = NLMSG_DATA(nlm);
+        struct net_device *dev;
+        int err;
+        u8 pnaddr;
+
+        if (!capable(CAP_SYS_ADMIN))
+                return -EPERM;
+
+        ASSERT_RTNL();
+
+        if (rta[IFA_LOCAL - 1] == NULL)
+                return -EINVAL;
+
+        dev = __dev_get_by_index(&init_net, ifm->ifa_index);
+        if (dev == NULL)
+                return -ENODEV;
+
+        if (ifm->ifa_prefixlen > 0)
+                return -EADDRNOTAVAIL;
+
+        memcpy(&pnaddr, RTA_DATA(rta[IFA_LOCAL - 1]), 1);
+
+        err = phonet_address_del(dev, pnaddr);
+        if (!err)
+                rtmsg_notify(RTM_DELADDR, 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;
+        unsigned int orig_len = skb->len;
+
+        nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(struct ifaddrmsg));
+        ifm = NLMSG_DATA(nlh);
+        ifm->ifa_family = AF_PHONET;
+        ifm->ifa_prefixlen = 0;
+        ifm->ifa_flags = IFA_F_PERMANENT;
+        ifm->ifa_scope = RT_SCOPE_HOST;
+        ifm->ifa_index = dev->ifindex;
+        RTA_PUT(skb, IFA_LOCAL, 1, &addr);
+        nlh->nlmsg_len = skb->len - orig_len;
+
+        return 0;
+
+nlmsg_failure:
+rtattr_failure:
+        skb_trim(skb, orig_len);
+
+        return -1;
+}
+
+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, newaddr_doit, NULL);
+        rtnl_register(PF_PHONET, RTM_DELADDR, deladdr_doit, NULL);
+        rtnl_register(PF_PHONET, RTM_GETADDR, NULL, getaddr_dumpit);
+}