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Message-Id: <1221577694-4513-6-git-send-email-remi.denis-courmont@nokia.com>
Date: Tue, 16 Sep 2008 18:08:06 +0300
From: Rémi Denis-Courmont
<remi.denis-courmont@...ia.com>
To: netdev@...r.kernel.org
Subject: [PATCH 06/14] 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@...ia.com>
---
include/net/phonet/phonet.h | 1 +
net/phonet/Makefile | 1 +
net/phonet/af_phonet.c | 1 +
net/phonet/pn_netlink.c | 240 +++++++++++++++++++++++++++++++++++++++++++
4 files changed, 243 insertions(+), 0 deletions(-)
create mode 100644 net/phonet/pn_netlink.c
diff --git a/include/net/phonet/phonet.h b/include/net/phonet/phonet.h
index be02ee9..d62883c 100644
--- a/include/net/phonet/phonet.h
+++ b/include/net/phonet/phonet.h
@@ -68,4 +68,5 @@ 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
diff --git a/net/phonet/Makefile b/net/phonet/Makefile
index 980a386..4143c3e 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 744b47f..12c72e1 100644
--- a/net/phonet/af_phonet.c
+++ b/net/phonet/af_phonet.c
@@ -210,6 +210,7 @@ static int __init phonet_init(void)
}
dev_add_pack(&phonet_packet_type);
+ phonet_netlink_register();
return 0;
unregister:
diff --git a/net/phonet/pn_netlink.c b/net/phonet/pn_netlink.c
new file mode 100644
index 0000000..121b62e
--- /dev/null
+++ b/net/phonet/pn_netlink.c
@@ -0,0 +1,240 @@
+/*
+ * File: pn_netlink.c
+ *
+ * Phonet netlink interface
+ *
+ * Copyright (C) 2008 Nokia Corporation.
+ *
+ * Contact: Remi Denis-Courmont <remi.denis-courmont@...ia.com>
+ * Original author: Sakari Ailus <sakari.ailus@...ia.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 phonet_address *ifaddr,
+ u32 pid, u32 seq, int event);
+
+static void rtmsg_notify(int event, struct phonet_address *pna)
+{
+ 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, pna, 0, 0, event);
+ if (err < 0) {
+ WARN_ON(err == -EMSGSIZE);
+ kfree_skb(skb);
+ goto errout;
+ }
+ err = rtnl_notify(skb, dev_net(pna->pnd->netdev), 0,
+ RTNLGRP_PHONET_IFADDR, NULL, GFP_KERNEL);
+errout:
+ if (err < 0)
+ rtnl_set_sk_err(dev_net(pna->pnd->netdev),
+ 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;
+ struct phonet_device *pnd;
+ struct phonet_address *pna;
+ uint8_t 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 > 8)
+ return -EINVAL;
+
+ memcpy((void *)&pnaddr, RTA_DATA(rta[IFA_LOCAL - 1]), 1);
+
+ spin_lock_bh(&pndevs.lock);
+ if (phonet_addr2addr(pnaddr, PN_FIND_EXACT)) {
+ spin_unlock_bh(&pndevs.lock);
+ return -EADDRINUSE;
+ }
+ pnd = __phonet_get_by_index(ifm->ifa_index);
+ if (pnd == NULL)
+ pnd = phonet_device_alloc(dev);
+ spin_unlock_bh(&pndevs.lock);
+ if (pnd == NULL)
+ return -ENOMEM;
+
+ pna = phonet_address_alloc();
+ if (pna == NULL) {
+ spin_lock_bh(&pndevs.lock);
+ if (list_empty(&pnd->own))
+ phonet_device_free(pnd);
+ spin_unlock_bh(&pndevs.lock);
+ return -ENOMEM;
+ }
+ /*
+ * Now we have a Phonet device where the already allocated address
+ * needs to be added to. Address manipulation is already protected
+ * by rtnl_lock, so pndevs.lock isn't needed all the time.
+ */
+ pna->pnd = pnd;
+ pna->addr = pnaddr;
+ pna->prefix = ifm->ifa_prefixlen;
+
+ spin_lock_bh(&pndevs.lock);
+ phonet_address_add(&pnd->own, pna);
+ spin_unlock_bh(&pndevs.lock);
+
+ rtmsg_notify(RTM_NEWADDR, pna);
+
+ return 0;
+}
+
+static int deladdr_doit(struct sk_buff *skb, struct nlmsghdr *nlm, void *attr)
+{
+ struct rtattr **rta = attr;
+ struct ifaddrmsg *ifm = NLMSG_DATA(nlm);
+ struct phonet_address *pna;
+ struct phonet_device *pnd = NULL;
+ int err;
+ uint8_t pnaddr;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ ASSERT_RTNL();
+
+ if (rta[IFA_LOCAL - 1] == NULL)
+ return -EINVAL;
+
+ memcpy((void *)&pnaddr, RTA_DATA(rta[IFA_LOCAL - 1]), 1);
+
+ spin_lock_bh(&pndevs.lock);
+ err = -ENODEV;
+ pnd = __phonet_get_by_index(ifm->ifa_index);
+ if (!pnd)
+ goto out;
+
+ pna = phonet_dev2addr(pnd, pnaddr, PN_FIND_EXACT);
+ if (!pna)
+ goto out;
+
+ phonet_address_free(pna);
+ if (list_empty(&pnd->own))
+ phonet_device_free(pnd);
+ spin_unlock_bh(&pndevs.lock);
+ rtmsg_notify(RTM_DELADDR, pna);
+ return 0;
+
+out:
+ spin_unlock_bh(&pndevs.lock);
+ return err;
+}
+
+static int fill_addr(struct sk_buff *skb, struct phonet_address *ifaddr,
+ 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 = ifaddr->prefix;
+ ifm->ifa_flags = IFA_F_PERMANENT;
+ ifm->ifa_scope = RT_SCOPE_HOST;
+ ifm->ifa_index = ifaddr->pnd->netdev->ifindex;
+ RTA_PUT(skb, IFA_LOCAL, 1, &ifaddr->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 list_head *ptr;
+ int dev_idx = 0, addr_idx = 0;
+ int dev_start_idx, addr_start_idx;
+
+ dev_start_idx = cb->args[0];
+ addr_start_idx = cb->args[1];
+
+ spin_lock_bh(&pndevs.lock);
+
+ for (ptr = pndevs.list.next; ptr != &pndevs.list;
+ ptr = ptr->next, dev_idx++) {
+ struct list_head *ptr2;
+ struct phonet_device *pnd =
+ list_entry(ptr, struct phonet_device, list);
+
+ if (dev_idx < dev_start_idx)
+ continue;
+ else if (dev_idx > dev_start_idx)
+ addr_start_idx = 0;
+
+ addr_idx = 0;
+
+ for (ptr2 = pnd->own.next; ptr2 != &pnd->own;
+ ptr2 = ptr2->next, addr_idx++) {
+ struct phonet_address *pna =
+ list_entry(ptr2, struct phonet_address, list);
+
+ if (addr_idx < addr_start_idx)
+ continue;
+
+ if (fill_addr(skb, pna, 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);
+}
--
1.5.4.3
--
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