netdev - [RFC PATCH 13/24] net: rbridge: Add set

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Date:	Wed, 24 Sep 2014 17:52:09 +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 13/24] net: rbridge: Add set_node function

allow daemon to set distant Rbridges information in local database
daemon has to periodically update distant Rbridges informations in local database
create a new node only if change on distant RBridge information are detected

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 | 78 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 78 insertions(+)

diff --git a/net/bridge/rbridge/rbr_netlink.c b/net/bridge/rbridge/rbr_netlink.c
index 889e6c8..bb893f0 100644
--- a/net/bridge/rbridge/rbr_netlink.c
+++ b/net/bridge/rbridge/rbr_netlink.c
@@ -38,9 +38,87 @@ static struct genl_multicast_group trill_mcgrps[] = {
 	[TRILL_MCGRP_OFFSET] = {.name = TRILL_MCAST_NAME,},
 };
 
+static int create_node(struct net_bridge_port *p, struct rbr *rbr,
+		       struct rbr_nickinfo *rbr_ni_partial,
+		       struct genl_info *info)
+{
+	size_t size = 0;
+	size_t old_size = 0;
+	struct rbr_node *old;
+	struct rbr_nickinfo *rbr_ni;
+
+	if (rbr_ni_partial == NULL)
+		return -EINVAL;
+
+	size = RBR_NI_TOTALSIZE(rbr_ni_partial);
+	if (size > PAGE_SIZE - sizeof(struct trill_nl_header)) {
+		pr_warn_ratelimited
+		    ("create_node: size > (PAGE_SIZE-nickinfo_offset)\n");
+		return -EINVAL;
+	}
+	rbr_ni = kzalloc(size, GFP_KERNEL);
+	if (!rbr_ni)
+		return -ENOMEM;
+	old = rbr->rbr_nodes[rbr_ni_partial->nick];
+	nla_memcpy(rbr_ni, info->attrs[TRILL_ATTR_BIN], size);
+	if (old)
+		old_size = RBR_NI_TOTALSIZE(old->rbr_ni);
+	/* replace old node by a new one only if nickname information have changed */
+	if (old == NULL || old_size != size ||
+	    memcmp(old->rbr_ni, rbr_ni, size)) {
+		struct rbr_node *new;
+
+		new = kzalloc(sizeof(*old), GFP_KERNEL);
+		if (!new) {
+			kfree(rbr_ni);
+			return -ENOMEM;
+		}
+		atomic_set(&new->refs, 1);
+		new->rbr_ni = rbr_ni;
+		/* avoid deleting node while it is been used for routing */
+		rcu_assign_pointer(rbr->rbr_nodes[rbr_ni->nick], new);
+		if (old)
+			rbr_node_put(old);
+	} else {
+		kfree(rbr_ni);
+	}
+
+	return 0;
+}
+
 static int trill_cmd_set_nicks_info(struct sk_buff *skb, struct genl_info *info)
 {
+	struct trill_nl_header *trnlhdr;
+	struct rbr_nickinfo rbr_ni;
+	struct net_device *source_port = NULL;
+	struct net *net = sock_net(skb->sk);
+	struct net_bridge_port *p = NULL;
+	int err = -EINVAL;
+
+	nla_memcpy(&rbr_ni, info->attrs[TRILL_ATTR_BIN], sizeof(rbr_ni));
+	if (!VALID_NICK(rbr_ni.nick))
+		goto fail;
+
+	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) || !(p->br->rbr))
+		goto fail;
+
+	err = create_node(p, p->br->rbr, &rbr_ni, info);
+	if (err)
+		goto fail;
+
 	return 0;
+
+ fail:
+	printk(KERN_WARNING "trill_cmd_set_nicks_info FAILED\n");
+	return err;
 }
 
 static int trill_cmd_get_nicks_info(struct sk_buff *skb, struct genl_info *info)
-- 
1.9.1

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