tipc: add net set to new netlink api

Add TIPC_NL_NET_SET command to the new tipc netlink API.

This command can set the network id and network (tipc) address.

Netlink logical layout of network set message:
-> net
     [ -> id ]
     [ -> address ]

Signed-off-by: Richard Alpe <richard.alpe@ericsson.com>
Reviewed-by: Erik Hugne <erik.hugne@ericsson.com>
Reviewed-by: Jon Maloy <jon.maloy@ericsson.com>
Acked-by: Ying Xue <ying.xue@windriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 47 insertions, 0 deletions

diff --git a/net/tipc/net.c b/net/tipc/net.c
index d9e666a1be9d..cf13df3cde8f 100644
--- a/net/tipc/net.c
+++ b/net/tipc/net.c
@@ -197,3 +197,50 @@ out:
 
         return skb->len;
 }
+
+int tipc_nl_net_set(struct sk_buff *skb, struct genl_info *info)
+{
+        int err;
+        struct nlattr *attrs[TIPC_NLA_NET_MAX + 1];
+
+        if (!info->attrs[TIPC_NLA_NET])
+                return -EINVAL;
+
+        err = nla_parse_nested(attrs, TIPC_NLA_NET_MAX,
+                               info->attrs[TIPC_NLA_NET],
+                               tipc_nl_net_policy);
+        if (err)
+                return err;
+
+        if (attrs[TIPC_NLA_NET_ID]) {
+                u32 val;
+
+                /* Can't change net id once TIPC has joined a network */
+                if (tipc_own_addr)
+                        return -EPERM;
+
+                val = nla_get_u32(attrs[TIPC_NLA_NET_ID]);
+                if (val < 1 || val > 9999)
+                        return -EINVAL;
+
+                tipc_net_id = val;
+        }
+
+        if (attrs[TIPC_NLA_NET_ADDR]) {
+                u32 addr;
+
+                /* Can't change net addr once TIPC has joined a network */
+                if (tipc_own_addr)
+                        return -EPERM;
+
+                addr = nla_get_u32(attrs[TIPC_NLA_NET_ADDR]);
+                if (!tipc_addr_node_valid(addr))
+                        return -EINVAL;
+
+                rtnl_lock();
+                tipc_net_start(addr);
+                rtnl_unlock();
+        }
+
+        return 0;
+}