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netlink: Split into generic and Linux-specific parts.

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The parts of the netlink module that are related to sockets are
Linux-specific, since only Linux has AF_NETLINK sockets.  The rest can be
built anywhere.  This commit breaks them into two modules, and builds the
generic one on all platforms.

Acked-by: Jesse Gross <jesse@nicira.com>
This commit is contained in:
Ben Pfaff
2010-12-10 09:51:03 -08:00
parent 365a25176b
commit 2fe27d5ad2
10 changed files with 931 additions and 841 deletions
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78
lib/netlink-socket.h Normal file
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/*
* Copyright (c) 2008, 2009, 2010 Nicira Networks.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef NETLINK_SOCKET_H
#define NETLINK_SOCKET_H 1
/* Netlink socket definitions.
*
* Netlink is a datagram-based network protocol primarily for communication
* between user processes and the kernel, and mainly on Linux. Netlink is
* specified in RFC 3549, "Linux Netlink as an IP Services Protocol".
*
* Netlink is not suitable for use in physical networks of heterogeneous
* machines because host byte order is used throughout.
*
* This header file defines functions for working with Netlink sockets, which
* are Linux-specific. For Netlink protocol definitions, see
* netlink-protocol.h. For helper functions for working with Netlink messages,
* see netlink.h.
*/
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
#include <sys/uio.h>
struct ofpbuf;
struct nl_sock;
#ifndef HAVE_NETLINK
#error "netlink-socket.h is only for hosts that support Netlink sockets"
#endif
/* Netlink sockets. */
int nl_sock_create(int protocol, int multicast_group,
size_t so_sndbuf, size_t so_rcvbuf,
struct nl_sock **);
void nl_sock_destroy(struct nl_sock *);
int nl_sock_send(struct nl_sock *, const struct ofpbuf *, bool wait);
int nl_sock_sendv(struct nl_sock *sock, const struct iovec iov[], size_t n_iov,
bool wait);
int nl_sock_recv(struct nl_sock *, struct ofpbuf **, bool wait);
int nl_sock_transact(struct nl_sock *, const struct ofpbuf *request,
struct ofpbuf **reply);
void nl_sock_wait(const struct nl_sock *, short int events);
/* Table dumping. */
struct nl_dump {
struct nl_sock *sock; /* Socket being dumped. */
uint32_t seq; /* Expected nlmsg_seq for replies. */
struct ofpbuf *buffer; /* Receive buffer currently being iterated. */
int status; /* 0=OK, EOF=done, or positive errno value. */
};
void nl_dump_start(struct nl_dump *, struct nl_sock *,
const struct ofpbuf *request);
bool nl_dump_next(struct nl_dump *, struct ofpbuf *reply);
int nl_dump_done(struct nl_dump *);
/* Miscellaneous */
int nl_lookup_genl_family(const char *name, int *number);
#endif /* netlink-socket.h */