tipc: add link set to new netlink api

Add TIPC_NL_LINK_SET to the new tipc netlink API.

This command can set one or more link properties for a particular
link.

Netlink logical layout of link set message:
-> link
    -> name
    -> properties
        [ -> tolerance ]
        [ -> priority ]
        [ -> window ]

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, 80 insertions, 0 deletions

diff --git a/include/uapi/linux/tipc_netlink.h b/include/uapi/linux/tipc_netlink.h
index 1034fb43d32e..2deb7fd8d85d 100644
--- a/include/uapi/linux/tipc_netlink.h
+++ b/include/uapi/linux/tipc_netlink.h
@@ -48,6 +48,7 @@ enum {
         TIPC_NL_SOCK_GET,
         TIPC_NL_PUBL_GET,
         TIPC_NL_LINK_GET,
+        TIPC_NL_LINK_SET,
 
         __TIPC_NL_CMD_MAX,
         TIPC_NL_CMD_MAX = __TIPC_NL_CMD_MAX - 1
diff --git a/net/tipc/link.c b/net/tipc/link.c
index bdc4b5e5bf56..6785dcfd2d23 100644
--- a/net/tipc/link.c
+++ b/net/tipc/link.c
@@ -2441,6 +2441,79 @@ int tipc_nl_parse_link_prop(struct nlattr *prop, struct nlattr *props[])
         return 0;
 }
 
+int tipc_nl_link_set(struct sk_buff *skb, struct genl_info *info)
+{
+        int err;
+        int res = 0;
+        int bearer_id;
+        char *name;
+        struct tipc_link *link;
+        struct tipc_node *node;
+        struct nlattr *attrs[TIPC_NLA_LINK_MAX + 1];
+
+        if (!info->attrs[TIPC_NLA_LINK])
+                return -EINVAL;
+
+        err = nla_parse_nested(attrs, TIPC_NLA_LINK_MAX,
+                               info->attrs[TIPC_NLA_LINK],
+                               tipc_nl_link_policy);
+        if (err)
+                return err;
+
+        if (!attrs[TIPC_NLA_LINK_NAME])
+                return -EINVAL;
+
+        name = nla_data(attrs[TIPC_NLA_LINK_NAME]);
+
+        node = tipc_link_find_owner(name, &bearer_id);
+        if (!node)
+                return -EINVAL;
+
+        tipc_node_lock(node);
+
+        link = node->links[bearer_id];
+        if (!link) {
+                res = -EINVAL;
+                goto out;
+        }
+
+        if (attrs[TIPC_NLA_LINK_PROP]) {
+                struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
+
+                err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_LINK_PROP],
+                                              props);
+                if (err) {
+                        res = err;
+                        goto out;
+                }
+
+                if (props[TIPC_NLA_PROP_TOL]) {
+                        u32 tol;
+
+                        tol = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
+                        link_set_supervision_props(link, tol);
+                        tipc_link_proto_xmit(link, STATE_MSG, 0, 0, tol, 0, 0);
+                }
+                if (props[TIPC_NLA_PROP_PRIO]) {
+                        u32 prio;
+
+                        prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
+                        link->priority = prio;
+                        tipc_link_proto_xmit(link, STATE_MSG, 0, 0, 0, prio, 0);
+                }
+                if (props[TIPC_NLA_PROP_WIN]) {
+                        u32 win;
+
+                        win = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
+                        tipc_link_set_queue_limits(link, win);
+                }
+        }
+
+out:
+        tipc_node_unlock(node);
+
+        return res;
+}
 int __tipc_nl_add_stats(struct sk_buff *skb, struct tipc_stats *s)
 {
         int i;
diff --git a/net/tipc/link.h b/net/tipc/link.h
index 8e3542a4a037..3738ba11ce00 100644
--- a/net/tipc/link.h
+++ b/net/tipc/link.h
@@ -242,6 +242,7 @@ void tipc_link_retransmit(struct tipc_link *l_ptr,
 
 int tipc_nl_link_dump(struct sk_buff *skb, struct netlink_callback *cb);
 int tipc_nl_link_get(struct sk_buff *skb, struct genl_info *info);
+int tipc_nl_link_set(struct sk_buff *skb, struct genl_info *info);
 int tipc_nl_parse_link_prop(struct nlattr *prop, struct nlattr *props[]);
 
 /*
diff --git a/net/tipc/netlink.c b/net/tipc/netlink.c
index ea168b889caa..d4444e59bf98 100644
--- a/net/tipc/netlink.c
+++ b/net/tipc/netlink.c
@@ -144,6 +144,11 @@ static const struct genl_ops tipc_genl_v2_ops[] = {
                 .doit   = tipc_nl_link_get,
                 .dumpit = tipc_nl_link_dump,
                 .policy = tipc_nl_policy,
+        },
+        {
+                .cmd    = TIPC_NL_LINK_SET,
+                .doit   = tipc_nl_link_set,
+                .policy = tipc_nl_policy,
         }
 };