tipc: add link broadcast get

The command prints the actually method that multicast
is running in the system.
Also 'ratio' value for AUTOSELECT method.

A sample usage is shown below:
$tipc link get broadcast
BROADCAST

$tipc link get broadcast
AUTOSELECT ratio:30%

$tipc link get broadcast -j -p
[ {
        "method": "AUTOSELECT"
    },{
        "ratio": 30
    } ]

Acked-by: Jon Maloy <jon.maloy@ericsson.com>
Signed-off-by: Hoang Le <hoang.h.le@dektech.com.au>
Signed-off-by: David Ahern <dsahern@gmail.com>

diff --git a/tipc/link.c b/tipc/link.c
index e3b10bb7b3d4aa866d5a8485edb4ffc67dd67236..e123c18635756917943dc6f48a97d592db7b4785 100644 (file)
--- a/tipc/link.c
+++ b/tipc/link.c
@@ -175,10 +175,92 @@ static void cmd_link_get_help(struct cmdl *cmdl)
                "PROPERTIES\n"
                " tolerance             - Get link tolerance\n"
                " priority              - Get link priority\n"
-               " window                - Get link window\n",
+               " window                - Get link window\n"
+               " broadcast             - Get link broadcast\n",
                cmdl->argv[0]);
 }
 
+static int cmd_link_get_bcast_cb(const struct nlmsghdr *nlh, void *data)
+{
+       int *prop = data;
+       int prop_ratio = TIPC_NLA_PROP_BROADCAST_RATIO;
+       struct genlmsghdr *genl = mnl_nlmsg_get_payload(nlh);
+       struct nlattr *info[TIPC_NLA_MAX + 1] = {};
+       struct nlattr *attrs[TIPC_NLA_LINK_MAX + 1] = {};
+       struct nlattr *props[TIPC_NLA_PROP_MAX + 1] = {};
+       int bc_mode;
+
+       mnl_attr_parse(nlh, sizeof(*genl), parse_attrs, info);
+       if (!info[TIPC_NLA_LINK])
+               return MNL_CB_ERROR;
+
+       mnl_attr_parse_nested(info[TIPC_NLA_LINK], parse_attrs, attrs);
+       if (!attrs[TIPC_NLA_LINK_PROP])
+               return MNL_CB_ERROR;
+
+       mnl_attr_parse_nested(attrs[TIPC_NLA_LINK_PROP], parse_attrs, props);
+       if (!props[*prop])
+               return MNL_CB_ERROR;
+
+       bc_mode = mnl_attr_get_u32(props[*prop]);
+
+       new_json_obj(json);
+       open_json_object(NULL);
+       switch (bc_mode) {
+       case 0x1:
+               print_string(PRINT_ANY, "method", "%s\n", "BROADCAST");
+               break;
+       case 0x2:
+               print_string(PRINT_ANY, "method", "%s\n", "REPLICAST");
+               break;
+       case 0x4:
+               print_string(PRINT_ANY, "method", "%s", "AUTOSELECT");
+               close_json_object();
+               open_json_object(NULL);
+               print_uint(PRINT_ANY, "ratio", " ratio:%u%\n",
+                          mnl_attr_get_u32(props[prop_ratio]));
+               break;
+       default:
+               print_string(PRINT_ANY, NULL, "UNKNOWN\n", NULL);
+               break;
+       }
+       close_json_object();
+       delete_json_obj();
+       return MNL_CB_OK;
+}
+
+static void cmd_link_get_bcast_help(struct cmdl *cmdl)
+{
+       fprintf(stderr, "Usage: %s link get PPROPERTY\n\n"
+               "PROPERTIES\n"
+               " broadcast             - Get link broadcast\n",
+               cmdl->argv[0]);
+}
+
+static int cmd_link_get_bcast(struct nlmsghdr *nlh, const struct cmd *cmd,
+                            struct cmdl *cmdl, void *data)
+{
+       int prop = TIPC_NLA_PROP_BROADCAST;
+       char buf[MNL_SOCKET_BUFFER_SIZE];
+       struct nlattr *attrs;
+
+       if (help_flag) {
+               (cmd->help)(cmdl);
+               return -EINVAL;
+       }
+
+       nlh = msg_init(buf, TIPC_NL_LINK_GET);
+       if (!nlh) {
+               fprintf(stderr, "error, message initialisation failed\n");
+               return -1;
+       }
+       attrs = mnl_attr_nest_start(nlh, TIPC_NLA_LINK);
+       /* Direct to broadcast-link setting */
+       mnl_attr_put_strz(nlh, TIPC_NLA_LINK_NAME, tipc_bclink_name);
+       mnl_attr_nest_end(nlh, attrs);
+       return msg_doit(nlh, cmd_link_get_bcast_cb, &prop);
+}
+
 static int cmd_link_get(struct nlmsghdr *nlh, const struct cmd *cmd,
                        struct cmdl *cmdl, void *data)
 {
@@ -186,6 +268,7 @@ static int cmd_link_get(struct nlmsghdr *nlh, const struct cmd *cmd,
                { PRIORITY_STR, cmd_link_get_prop,      cmd_link_get_help },
                { TOLERANCE_STR,        cmd_link_get_prop,      cmd_link_get_help },
                { WINDOW_STR,   cmd_link_get_prop,      cmd_link_get_help },
+               { BROADCAST_STR, cmd_link_get_bcast, cmd_link_get_bcast_help },
                { NULL }
        };