2dbc1ca76c
I have a patch against commit d378220c96
extending libnl with a facility to receive generic netlink messages sent
to multicast groups.
Essentially it add one new function genl_ctrl_resolve_grp which
prototype looks like this
int genl_ctrl_resolve_grp(struct nl_sock *sk, const char *family_name,
const char *grp_name)
It resolves the family name and the group name to group id. Then
the returned id can be used in nl_socket_add_membership to subscribe
to multicast messages.
Besides that it adds two more functions
uint32_t nl_socket_get_peer_groups(struct nl_sock *sk)
void nl_socket_set_peer_groups(struct nl_sock *sk, uint32_t groups)
allowing to modify the socket peer groups field. So it's possible to
multicast messages from the user space using the legacy interface.
Looks like there is no way (or I was not able to find one?) to modify
the netlink socket destination group from the user space, when the
group id is greater then 32.
83 lines
1.6 KiB
C
83 lines
1.6 KiB
C
#ifndef __LINUX_GENERIC_NETLINK_H
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#define __LINUX_GENERIC_NETLINK_H
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#include <linux/types.h>
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#include <linux/netlink.h>
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#define GENL_NAMSIZ 16 /* length of family name */
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#define GENL_MIN_ID NLMSG_MIN_TYPE
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#define GENL_MAX_ID 1023
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struct genlmsghdr {
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__u8 cmd;
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__u8 version;
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__u16 reserved;
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};
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#define GENL_HDRLEN NLMSG_ALIGN(sizeof(struct genlmsghdr))
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#define GENL_ADMIN_PERM 0x01
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#define GENL_CMD_CAP_DO 0x02
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#define GENL_CMD_CAP_DUMP 0x04
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#define GENL_CMD_CAP_HASPOL 0x08
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/*
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* List of reserved static generic netlink identifiers:
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*/
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#define GENL_ID_GENERATE 0
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#define GENL_ID_CTRL NLMSG_MIN_TYPE
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/**************************************************************************
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* Controller
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**************************************************************************/
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enum {
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CTRL_CMD_UNSPEC,
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CTRL_CMD_NEWFAMILY,
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CTRL_CMD_DELFAMILY,
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CTRL_CMD_GETFAMILY,
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CTRL_CMD_NEWOPS,
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CTRL_CMD_DELOPS,
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CTRL_CMD_GETOPS,
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CTRL_CMD_NEWMCAST_GRP,
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CTRL_CMD_DELMCAST_GRP,
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CTRL_CMD_GETMCAST_GRP, /* unused */
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__CTRL_CMD_MAX,
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};
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#define CTRL_CMD_MAX (__CTRL_CMD_MAX - 1)
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enum {
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CTRL_ATTR_UNSPEC,
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CTRL_ATTR_FAMILY_ID,
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CTRL_ATTR_FAMILY_NAME,
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CTRL_ATTR_VERSION,
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CTRL_ATTR_HDRSIZE,
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CTRL_ATTR_MAXATTR,
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CTRL_ATTR_OPS,
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CTRL_ATTR_MCAST_GROUPS,
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__CTRL_ATTR_MAX,
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};
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#define CTRL_ATTR_MAX (__CTRL_ATTR_MAX - 1)
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enum {
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CTRL_ATTR_OP_UNSPEC,
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CTRL_ATTR_OP_ID,
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CTRL_ATTR_OP_FLAGS,
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__CTRL_ATTR_OP_MAX,
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};
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#define CTRL_ATTR_OP_MAX (__CTRL_ATTR_OP_MAX - 1)
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enum {
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CTRL_ATTR_MCAST_GRP_UNSPEC,
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CTRL_ATTR_MCAST_GRP_NAME,
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CTRL_ATTR_MCAST_GRP_ID,
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__CTRL_ATTR_MCAST_GRP_MAX,
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};
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#define CTRL_ATTR_MCAST_GRP_MAX (__CTRL_ATTR_MCAST_GRP_MAX - 1)
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#endif /* __LINUX_GENERIC_NETLINK_H */
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