[Cluster-devel] [PATCH] cman-preconfig: allow cman to configure corosync multicast ttl

[Christine Caulfield]

On 15/03/11 08:15, Fabio M. Di Nitto wrote:
> syntax:
>
> <cman...>
>   <multicast ttl=".."/>
> </cman>
>
> Resolves: rhbz#684020
>
> Signed-off-by: Fabio M. Di Nitto<fdinitto at redhat.com>

ACK

> ---
>   cman/daemon/cman-preconfig.c    |   24 +++++++++++++++++++++---
>   config/tools/xml/cluster.rng.in |   17 +++++++++++++++--
>   2 files changed, 36 insertions(+), 5 deletions(-)
>
> diff --git a/cman/daemon/cman-preconfig.c b/cman/daemon/cman-preconfig.c
> index 5239d89..0b3e7fd 100644
> --- a/cman/daemon/cman-preconfig.c
> +++ b/cman/daemon/cman-preconfig.c
> @@ -276,7 +276,7 @@ static int add_udpu_members(struct objdb_iface_ver0 *objdb, hdb_handle_t interfa
>   	return 0;
>   }
>
> -static int add_ifaddr(struct objdb_iface_ver0 *objdb, char *mcast, char *ifaddr, int port, enum tx_mech transport)
> +static int add_ifaddr(struct objdb_iface_ver0 *objdb, char *mcast, char *ifaddr, int port, int ttl, enum tx_mech transport)
>   {
>   	hdb_handle_t totem_object_handle;
>   	hdb_handle_t find_handle;
> @@ -353,6 +353,19 @@ static int add_ifaddr(struct objdb_iface_ver0 *objdb, char *mcast, char *ifaddr,
>   		objdb->object_key_create_typed(interface_object_handle, "mcastport",
>   					       tmp, strlen(tmp)+1, OBJDB_VALUETYPE_STRING);
>
> +		/* paranoia check. corosync already does it */
> +		if ((ttl<  0) || (ttl>  255)) {
> +			sprintf(error_reason, "TTL value (%u) out of range (0 - 255)", ttl);
> +			return -1;
> +		}
> +
> +		/* add the key to the objdb only if value is not default */
> +		if (ttl != 1) {
> +			sprintf(tmp, "%d", ttl);
> +			objdb->object_key_create_typed(interface_object_handle, "ttl",
> +						       tmp, strlen(tmp)+1, OBJDB_VALUETYPE_STRING);
> +		}
> +
>   		num_interfaces++;
>   	}
>   	return ret;
> @@ -592,6 +605,7 @@ static int get_nodename(struct objdb_iface_ver0 *objdb)
>   	enum tx_mech transport = TX_MECH_UDP;
>   	char *str;
>   	int error;
> +	unsigned int ttl = 1;
>
>   	if (!getenv("CMAN_NOCONFIG")) {
>   		/* our nodename */
> @@ -661,6 +675,7 @@ static int get_nodename(struct objdb_iface_ver0 *objdb)
>   			if (objdb->object_find_next(find_handle2,&mcast_handle) == 0) {
>
>   				objdb_get_string(objdb, mcast_handle, "addr",&mcast_name);
> +				objdb_get_int(objdb, mcast_handle, "ttl",&ttl, 0);
>   			}
>   			objdb->object_find_destroy(find_handle2);
>   		}
> @@ -730,7 +745,7 @@ static int get_nodename(struct objdb_iface_ver0 *objdb)
>   		}
>   	}
>
> -	if (add_ifaddr(objdb, mcast_name, nodename, portnum, transport)) {
> +	if (add_ifaddr(objdb, mcast_name, nodename, portnum, ttl, transport)) {
>   		write_cman_pipe(error_reason);
>   		return -1;
>   	}
> @@ -740,6 +755,7 @@ static int get_nodename(struct objdb_iface_ver0 *objdb)
>   	objdb->object_find_create(node_object_handle,"altname", strlen("altname"),&find_handle);
>   	while (objdb->object_find_next(find_handle,&alt_object) == 0) {
>   		unsigned int port;
> +		unsigned int altttl = 1;
>   		char *node;
>   		char *mcast;
>
> @@ -749,11 +765,13 @@ static int get_nodename(struct objdb_iface_ver0 *objdb)
>
>   		objdb_get_int(objdb, alt_object, "port",&port, portnum);
>
> +		objdb_get_int(objdb, alt_object, "ttl",&altttl, ttl);
> +
>   		if (objdb_get_string(objdb, alt_object, "mcast",&mcast)) {
>   			mcast = mcast_name;
>   		}
>
> -		if (add_ifaddr(objdb, mcast, node, portnum, transport)) {
> +		if (add_ifaddr(objdb, mcast, node, portnum, altttl, transport)) {
>   			write_cman_pipe(error_reason);
>   			return -1;
>   		}
> diff --git a/config/tools/xml/cluster.rng.in b/config/tools/xml/cluster.rng.in
> index 04906c9..c873cae 100644
> --- a/config/tools/xml/cluster.rng.in
> +++ b/config/tools/xml/cluster.rng.in
> @@ -147,14 +147,22 @@ To validate your cluster.conf against this schema, run:
>            instead of using the multicast address generated by cman. If
>            a user does not specify a multicast address, cman creates one. It
>            forms the upper 16 bits of the multicast address with 239.192 and
> -         forms the lower 16 bits based on the cluster ID.">  <attribute
> -         name="addr" rha:description="A multicast address specified
> +         forms the lower 16 bits based on the cluster ID.">
> +<optional>
> +<attribute name="addr" rha:description="A multicast address specified
>            by a user. If you do specify a multicast address, you should
>            use the 239.192.x.x series that cman uses. Otherwise, using a
>            multicast address outside that range may cause unpredictable
>            results. For example, using 224.0.0.x (All hosts on the network)
>            may not be routed correctly, or even routed at all by some
>            hardware." rha:sample="239.192.0.1"/>
> +</optional>
> +<optional>
> +<attribute name="ttl" rha:description="Define the TTL (time to live) of
> +         a multicast packets. Useful only if nodes are on different subnets and
> +         a multicast router is available in between." rha:default="1"
> +         rha:sample="24"/>
> +</optional>
>        </element>
>       </optional>
>      </element>
> @@ -734,6 +742,11 @@ To validate your cluster.conf against this schema, run:
>         <attribute name="mcast" rha:description="The multicast address
>             to use on the second interface. cman(5)"/>
>        </optional>
> +
> +<optional>
> +<attribute name="ttl" rha:description="The multicast TTL
> +          to use on the second interface. cman(5)"/>
> +</optional>
>       </element>
>      </optional>
>