Phonet: Netlink interface
Remi Denis-Courmont [Tue, 23 Sep 2008 03:04:30 +0000 (20:04 -0700)]
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>

include/net/phonet/phonet.h
net/phonet/Makefile
net/phonet/af_phonet.c
net/phonet/pn_netlink.c [new file with mode: 0644]

index c53f2ab..8b77794 100644 (file)
@@ -71,4 +71,5 @@ struct phonet_protocol {
 int phonet_proto_register(int protocol, struct phonet_protocol *pp);
 void phonet_proto_unregister(int protocol, struct phonet_protocol *pp);
 
+void phonet_netlink_register(void);
 #endif
index 980a386..4143c3e 100644 (file)
@@ -2,4 +2,5 @@ obj-$(CONFIG_PHONET) += phonet.o
 
 phonet-objs := \
        pn_dev.o \
+       pn_netlink.o \
        af_phonet.o
index a8ba6f1..5c729ba 100644 (file)
@@ -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 (file)
index 0000000..b1ea19a
--- /dev/null
@@ -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);
+}