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.
67 lines
2.2 KiB
C
67 lines
2.2 KiB
C
/*
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* netlink/socket.h Netlink Socket
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation version 2.1
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* of the License.
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*
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* Copyright (c) 2003-2008 Thomas Graf <tgraf@suug.ch>
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*/
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#ifndef NETLINK_SOCKET_H_
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#define NETLINK_SOCKET_H_
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#include <netlink/types.h>
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#include <netlink/handlers.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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extern struct nl_sock * nl_socket_alloc(void);
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extern struct nl_sock * nl_socket_alloc_cb(struct nl_cb *);
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extern void nl_socket_free(struct nl_sock *);
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extern uint32_t nl_socket_get_local_port(struct nl_sock *);
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extern void nl_socket_set_local_port(struct nl_sock *, uint32_t);
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extern int nl_socket_add_memberships(struct nl_sock *, int, ...);
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extern int nl_socket_add_membership(struct nl_sock *, int);
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extern int nl_socket_drop_memberships(struct nl_sock *, int, ...);
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extern int nl_socket_drop_membership(struct nl_sock *,
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int);
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extern void nl_join_groups(struct nl_sock *, int);
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extern uint32_t nl_socket_get_peer_port(struct nl_sock *);
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extern void nl_socket_set_peer_port(struct nl_sock *,
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uint32_t);
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extern uint32_t nl_socket_get_peer_groups(struct nl_sock *sk);
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extern void nl_socket_set_peer_groups(struct nl_sock *sk, uint32_t groups);
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extern struct nl_cb * nl_socket_get_cb(struct nl_sock *);
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extern void nl_socket_set_cb(struct nl_sock *,
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struct nl_cb *);
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extern int nl_socket_modify_cb(struct nl_sock *, enum nl_cb_type,
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enum nl_cb_kind,
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nl_recvmsg_msg_cb_t, void *);
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extern int nl_socket_set_buffer_size(struct nl_sock *, int, int);
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extern int nl_socket_set_passcred(struct nl_sock *, int);
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extern int nl_socket_recv_pktinfo(struct nl_sock *, int);
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extern void nl_socket_disable_seq_check(struct nl_sock *);
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extern unsigned int nl_socket_use_seq(struct nl_sock *);
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extern void nl_socket_disable_auto_ack(struct nl_sock *);
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extern void nl_socket_enable_auto_ack(struct nl_sock *);
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extern int nl_socket_get_fd(struct nl_sock *);
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extern int nl_socket_set_nonblocking(struct nl_sock *);
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extern void nl_socket_enable_msg_peek(struct nl_sock *);
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extern void nl_socket_disable_msg_peek(struct nl_sock *);
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#ifdef __cplusplus
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}
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#endif
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#endif
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