netdev - [RFC PATCH 09/24] net: rbridge: Get Rbridge nickname from daemon

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Message-Id: <1411573940-14079-10-git-send-email-ahmed@gandi.net>
Date:	Wed, 24 Sep 2014 17:52:05 +0200
From:	Ahmed Amamou <ahmed@...di.net>
To:	netdev@...r.kernel.org
Cc:	william@...di.net, f.cachereul@...halink.fr,
	Ahmed Amamou <ahmed@...di.net>,
	Kamel Haddadou <kamel@...di.net>
Subject: [RFC PATCH 09/24] net: rbridge: Get Rbridge nickname from daemon

added get and set nickname functions that allows daemon to check if
RBridge aleady have a nickname (daemon crash scenario)
if yes and nickname uniqueness is verified on toplogy no set nickname is provided by the daemon
if nickname is not unique or not existant daemon will set the automatically generated nickanme

Signed-off-by: Ahmed Amamou <ahmed@...di.net>
Signed-off-by: Kamel Haddadou <kamel@...di.net>
Signed-off-by: François Cachereul <f.cachereul@...halink.fr>
Signed-off-by: William Dauchy <william@...di.net>
---
 net/bridge/rbridge/rbr_netlink.c | 92 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 92 insertions(+)

diff --git a/net/bridge/rbridge/rbr_netlink.c b/net/bridge/rbridge/rbr_netlink.c
index eb7c902..ccba5ae 100644
--- a/net/bridge/rbridge/rbr_netlink.c
+++ b/net/bridge/rbridge/rbr_netlink.c
@@ -59,14 +59,106 @@ static int trill_cmd_set_treeroot_id(struct sk_buff *skb,
 	return 0;
 }
 
+/* trill_cmd_get_rbridge when started daemon inquire for already
+ * existant nickname
+ * bridge with TRILL capability may already have a nickname
+ * is daemon have crashed
+ */
 static int trill_cmd_get_rbridge(struct sk_buff *skb, struct genl_info *info)
 {
+	struct trill_nl_header *trnlhdr;
+	struct sk_buff *msg;
+	struct net_bridge_port *p;
+	struct net_device *source_port = NULL;
+	struct net *net = sock_net(skb->sk);
+	u16 nickname;
+	int err = -EINVAL;
+	int trill_genlseqnb = info->snd_seq;
+
+	trnlhdr = info->userhdr;
+	if (trnlhdr->ifindex)
+		source_port = __dev_get_by_index(net, trnlhdr->ifindex);
+
+	if (!source_port)
+		goto fail;
+
+	p = br_port_get_rcu(source_port);
+	if (!p || !(p->br))
+		goto fail;
+
+	if (p->br->rbr)
+		nickname = ntohs(p->br->rbr->nick);
+	else
+		nickname = RBRIDGE_NICKNAME_NONE;
+
+	err = -ENOMEM;
+	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
+	if (!msg)
+		goto fail;
+
+	trnlhdr = genlmsg_put(msg, info->snd_portid, trill_genlseqnb,
+			      &trill_genl_family, sizeof(*trnlhdr),
+			      TRILL_CMD_GET_RBRIDGE);
+	if (!trnlhdr)
+		goto fail_free;
+
+	trnlhdr->ifindex = KERNL_RESPONSE_INTERFACE;
+	nla_put_u16(msg, TRILL_ATTR_U16, nickname);
+	genlmsg_end(msg, trnlhdr);
+
+	err = genlmsg_reply(msg, info);
+	if (err)
+		goto fail;
+
 	return 0;
+
+ fail_free:
+	nlmsg_free(msg);
+ fail:
+	printk(KERN_WARNING "trill_cmd_get_rbridge FAILED\n");
+	return err;
 }
 
 static int trill_cmd_set_rbridge(struct sk_buff *skb, struct genl_info *info)
 {
+	struct trill_nl_header *trnlhdr;
+	struct net_device *source_port = NULL;
+	struct net_bridge_port *p = NULL;
+	struct net_bridge *br = NULL;
+	struct net *net = sock_net(skb->sk);
+	u16 nickname = nla_get_u16(info->attrs[TRILL_ATTR_U16]);
+
+	trnlhdr = info->userhdr;
+	if (trnlhdr->ifindex)
+		source_port = __dev_get_by_index(net, trnlhdr->ifindex);
+
+	if (!source_port)
+		goto fail;
+
+	p = br_port_get_rcu(source_port);
+	if (!p || !(p->br))
+		goto fail;
+
+	br = p->br;
+
+	/* if daemon has started and bridge TRILL capability
+	 * is not enabled then start it
+	 */
+	if (br->trill_enabled == BR_NO_TRILL)
+		br_trill_set_enabled(br, 1);
+
+	if (!(br->rbr))
+		goto fail;
+
+	spin_lock_bh(&br->lock);
+	br->rbr->nick = htons(nickname);
+	spin_unlock_bh(&br->lock);
+
 	return 0;
+
+ fail:
+	printk(KERN_WARNING "trill_cmd_set_bridge FAILED\n");
+	return -EINVAL;
 }
 
 static int trill_cmd_port_flush(struct sk_buff *skb, struct genl_info *info)
-- 
1.9.1

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