tipc: add net dump to new netlink api

Add TIPC_NL_NET_GET command to the new tipc netlink API.

This command dumps the network id of the node.

Netlink logical layout of returned network data:
-> net
    -> id

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>

4 files changed, 84 insertions, 2 deletions

diff --git a/include/uapi/linux/tipc_netlink.h b/include/uapi/linux/tipc_netlink.h
index 08a793374e8c..dcfd42002da7 100644
--- a/include/uapi/linux/tipc_netlink.h
+++ b/include/uapi/linux/tipc_netlink.h
@@ -53,6 +53,7 @@ enum {
         TIPC_NL_MEDIA_GET,
         TIPC_NL_MEDIA_SET,
         TIPC_NL_NODE_GET,
+        TIPC_NL_NET_GET,
 
         __TIPC_NL_CMD_MAX,
         TIPC_NL_CMD_MAX = __TIPC_NL_CMD_MAX - 1
@@ -67,6 +68,7 @@ enum {
         TIPC_NLA_LINK,                  /* nest */
         TIPC_NLA_MEDIA,                 /* nest */
         TIPC_NLA_NODE,                  /* nest */
+        TIPC_NLA_NET,                   /* nest */
 
         __TIPC_NLA_MAX,
         TIPC_NLA_MAX = __TIPC_NLA_MAX - 1
@@ -133,6 +135,15 @@ enum {
         TIPC_NLA_NODE_MAX = __TIPC_NLA_NODE_MAX - 1
 };
 
+/* Net info */
+enum {
+        TIPC_NLA_NET_UNSPEC,
+        TIPC_NLA_NET_ID,                /* u32 */
+
+        __TIPC_NLA_NET_MAX,
+        TIPC_NLA_NET_MAX = __TIPC_NLA_NET_MAX - 1
+};
+
 /* Publication info */
 enum {
         TIPC_NLA_PUBL_UNSPEC,
diff --git a/net/tipc/net.c b/net/tipc/net.c
index 93b9944a6a8b..d9e666a1be9d 100644
--- a/net/tipc/net.c
+++ b/net/tipc/net.c
@@ -42,6 +42,11 @@
 #include "node.h"
 #include "config.h"
 
+static const struct nla_policy tipc_nl_net_policy[TIPC_NLA_NET_MAX + 1] = {
+        [TIPC_NLA_NET_UNSPEC]   = { .type = NLA_UNSPEC },
+        [TIPC_NLA_NET_ID]       = { .type = NLA_U32 }
+};
+
 /*
  * The TIPC locking policy is designed to ensure a very fine locking
  * granularity, permitting complete parallel access to individual
@@ -138,3 +143,57 @@ void tipc_net_stop(void)
 
         pr_info("Left network mode\n");
 }
+
+static int __tipc_nl_add_net(struct tipc_nl_msg *msg)
+{
+        void *hdr;
+        struct nlattr *attrs;
+
+        hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_v2_family,
+                          NLM_F_MULTI, TIPC_NL_NET_GET);
+        if (!hdr)
+                return -EMSGSIZE;
+
+        attrs = nla_nest_start(msg->skb, TIPC_NLA_NET);
+        if (!attrs)
+                goto msg_full;
+
+        if (nla_put_u32(msg->skb, TIPC_NLA_NET_ID, tipc_net_id))
+                goto attr_msg_full;
+
+        nla_nest_end(msg->skb, attrs);
+        genlmsg_end(msg->skb, hdr);
+
+        return 0;
+
+attr_msg_full:
+        nla_nest_cancel(msg->skb, attrs);
+msg_full:
+        genlmsg_cancel(msg->skb, hdr);
+
+        return -EMSGSIZE;
+}
+
+int tipc_nl_net_dump(struct sk_buff *skb, struct netlink_callback *cb)
+{
+        int err;
+        int done = cb->args[0];
+        struct tipc_nl_msg msg;
+
+        if (done)
+                return 0;
+
+        msg.skb = skb;
+        msg.portid = NETLINK_CB(cb->skb).portid;
+        msg.seq = cb->nlh->nlmsg_seq;
+
+        err = __tipc_nl_add_net(&msg);
+        if (err)
+                goto out;
+
+        done = 1;
+out:
+        cb->args[0] = done;
+
+        return skb->len;
+}
diff --git a/net/tipc/net.h b/net/tipc/net.h
index 59ef3388be2c..60dc22fe9267 100644
--- a/net/tipc/net.h
+++ b/net/tipc/net.h
@@ -1,7 +1,7 @@
 /*
  * net/tipc/net.h: Include file for TIPC network routing code
  *
- * Copyright (c) 1995-2006, Ericsson AB
+ * Copyright (c) 1995-2006, 2014, Ericsson AB
  * Copyright (c) 2005, 2010-2011, Wind River Systems
  * All rights reserved.
  *
@@ -37,7 +37,12 @@
 #ifndef _TIPC_NET_H
 #define _TIPC_NET_H
 
+#include <net/genetlink.h>
+
 int tipc_net_start(u32 addr);
+
 void tipc_net_stop(void);
 
+int tipc_nl_net_dump(struct sk_buff *skb, struct netlink_callback *cb);
+
 #endif
diff --git a/net/tipc/netlink.c b/net/tipc/netlink.c
index 5b0e3c8457d2..c143f9c20f61 100644
--- a/net/tipc/netlink.c
+++ b/net/tipc/netlink.c
@@ -40,6 +40,7 @@
 #include "bearer.h"
 #include "link.h"
 #include "node.h"
+#include "net.h"
 #include <net/genetlink.h>
 
 static int handle_cmd(struct sk_buff *skb, struct genl_info *info)
@@ -79,7 +80,8 @@ static const struct nla_policy tipc_nl_policy[TIPC_NLA_MAX + 1] = {
         [TIPC_NLA_PUBL]         = { .type = NLA_NESTED, },
         [TIPC_NLA_LINK]         = { .type = NLA_NESTED, },
         [TIPC_NLA_MEDIA]        = { .type = NLA_NESTED, },
-        [TIPC_NLA_NODE]         = { .type = NLA_NESTED, }
+        [TIPC_NLA_NODE]         = { .type = NLA_NESTED, },
+        [TIPC_NLA_NET]          = { .type = NLA_NESTED, }
 };
 
 /* Legacy ASCII API */
@@ -173,6 +175,11 @@ static const struct genl_ops tipc_genl_v2_ops[] = {
                 .cmd    = TIPC_NL_NODE_GET,
                 .dumpit = tipc_nl_node_dump,
                 .policy = tipc_nl_policy,
+        },
+        {
+                .cmd    = TIPC_NL_NET_GET,
+                .dumpit = tipc_nl_net_dump,
+                .policy = tipc_nl_policy,
         }
 };