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Netlink_socket.c Join/Unjoin an MC group for event subscription

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Use a specific out of band device control to subscribe/unsubscribe a socket
to the driver event queue for notification.

Signed-off-by: Eitan Eliahu <eliahue@vmware.com>
Acked-by: Nithin Raju <nithin@vmware.com>
Acked-by: Saurabh Shah <ssaurabh@vmware.com>
Acked-by: Ankur Sharma <ankursharma@vmware.com>
Acked-by: Alin Gabriel Serdean <aserdean@cloudbasesolutions.com>
Signed-off-by: Ben Pfaff <blp@nicira.com>
This commit is contained in:
Eitan Eliahu
2014-09-11 10:01:02 -07:00
committed by Ben Pfaff
parent 988672a76f
commit b8f958eaf3
2 changed files with 47 additions and 44 deletions
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82
lib/netlink-socket.c
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@@ -332,6 +332,33 @@ done:
}
#endif /* _WIN32 */
#ifdef _WIN32
static int __inline
nl_sock_mcgroup(struct nl_sock *sock, unsigned int multicast_group, bool join)
{
struct ofpbuf request;
uint64_t request_stub[128];
struct ovs_header *ovs_header;
struct nlmsghdr *nlmsg;
int error;
ofpbuf_use_stub(&request, request_stub, sizeof request_stub);
nl_msg_put_genlmsghdr(&request, 0, OVS_WIN_NL_CTRL_FAMILY_ID, 0,
OVS_CTRL_CMD_MC_SUBSCRIBE_REQ,
OVS_WIN_CONTROL_VERSION);
ovs_header = ofpbuf_put_uninit(&request, sizeof *ovs_header);
ovs_header->dp_ifindex = 0;
nl_msg_put_u32(&request, OVS_NL_ATTR_MCAST_GRP, multicast_group);
nl_msg_put_u8(&request, OVS_NL_ATTR_MCAST_JOIN, join ? 1 : 0);
error = nl_sock_send(sock, &request, true);
ofpbuf_uninit(&request);
return error;
}
#endif
/* Tries to add 'sock' as a listener for 'multicast_group'. Returns 0 if
* successful, otherwise a positive errno value.
*
@@ -347,31 +374,12 @@ int
nl_sock_join_mcgroup(struct nl_sock *sock, unsigned int multicast_group)
{
#ifdef _WIN32
#define OVS_VPORT_MCGROUP_FALLBACK_ID 33
struct ofpbuf msg_buf;
struct message_multicast
{
struct nlmsghdr;
/* if true, join; if else, leave */
unsigned char join;
unsigned int groupId;
};
struct message_multicast msg = { 0 };
msg.nlmsg_len = sizeof(struct message_multicast);
msg.nlmsg_type = OVS_VPORT_MCGROUP_FALLBACK_ID;
msg.nlmsg_flags = 0;
msg.nlmsg_seq = 0;
msg.nlmsg_pid = sock->pid;
msg.join = 1;
msg.groupId = multicast_group;
msg_buf.base_ = &msg;
msg_buf.data_ = &msg;
msg_buf.size_ = msg.nlmsg_len;
nl_sock_send__(sock, &msg_buf, msg.nlmsg_seq, 0);
int error = nl_sock_mcgroup(sock, multicast_group, true);
if (error) {
VLOG_WARN("could not join multicast group %u (%s)",
multicast_group, ovs_strerror(errno));
return errno;
}
#else
if (setsockopt(sock->fd, SOL_NETLINK, NETLINK_ADD_MEMBERSHIP,
&multicast_group, sizeof multicast_group) < 0) {
@@ -397,24 +405,12 @@ int
nl_sock_leave_mcgroup(struct nl_sock *sock, unsigned int multicast_group)
{
#ifdef _WIN32
struct ofpbuf msg_buf;
struct message_multicast
{
struct nlmsghdr;
/* if true, join; if else, leave*/
unsigned char join;
};
struct message_multicast msg = { 0 };
nl_msg_put_nlmsghdr(&msg, sizeof(struct message_multicast),
multicast_group, 0);
msg.join = 0;
msg_buf.base_ = &msg;
msg_buf.data_ = &msg;
msg_buf.size_ = msg.nlmsg_len;
nl_sock_send__(sock, &msg_buf, msg.nlmsg_seq, 0);
int error = nl_sock_mcgroup(sock, multicast_group, false);
if (error) {
VLOG_WARN("could not leave multicast group %u (%s)",
multicast_group, ovs_strerror(errno));
return errno;
}
#else
if (setsockopt(sock->fd, SOL_NETLINK, NETLINK_DROP_MEMBERSHIP,
&multicast_group, sizeof multicast_group) < 0) {