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#pragma once
/***
This file is part of systemd.
Copyright 2013 Tom Gundersen <teg@jklm.no>
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <linux/netlink.h>
#include <systemd/sd-netlink.h>
#include "list.h"
#include "netlink-types.h"
#include "prioq.h"
#include "refcnt.h"
#define RTNL_DEFAULT_TIMEOUT ((usec_t) (25 * USEC_PER_SEC))
#define RTNL_WQUEUE_MAX 1024
#define RTNL_RQUEUE_MAX 64*1024
#define RTNL_CONTAINER_DEPTH 32
struct reply_callback {
sd_netlink_message_handler_t callback;
void *userdata;
usec_t timeout;
uint64_t serial;
unsigned prioq_idx;
};
struct match_callback {
sd_netlink_message_handler_t callback;
uint16_t type;
void *userdata;
LIST_FIELDS(struct match_callback, match_callbacks);
};
struct sd_netlink {
RefCount n_ref;
int fd;
union {
struct sockaddr sa;
struct sockaddr_nl nl;
} sockaddr;
Hashmap *broadcast_group_refs;
bool broadcast_group_dont_leave:1; /* until we can rely on 4.2 */
sd_netlink_message **rqueue;
unsigned rqueue_size;
size_t rqueue_allocated;
sd_netlink_message **rqueue_partial;
unsigned rqueue_partial_size;
size_t rqueue_partial_allocated;
struct nlmsghdr *rbuffer;
size_t rbuffer_allocated;
bool processing:1;
uint32_t serial;
struct Prioq *reply_callbacks_prioq;
Hashmap *reply_callbacks;
LIST_HEAD(struct match_callback, match_callbacks);
pid_t original_pid;
sd_event_source *io_event_source;
sd_event_source *time_event_source;
sd_event_source *exit_event_source;
sd_event *event;
};
struct netlink_attribute {
size_t offset; /* offset from hdr to attribute */
bool nested:1;
bool net_byteorder:1;
};
struct netlink_container {
const struct NLTypeSystem *type_system; /* the type system of the container */
size_t offset; /* offset from hdr to the start of the container */
struct netlink_attribute *attributes;
unsigned short n_attributes; /* number of attributes in container */
};
struct sd_netlink_message {
RefCount n_ref;
sd_netlink *rtnl;
struct nlmsghdr *hdr;
struct netlink_container containers[RTNL_CONTAINER_DEPTH];
unsigned n_containers; /* number of containers */
bool sealed:1;
bool broadcast:1;
sd_netlink_message *next; /* next in a chain of multi-part messages */
};
int message_new(sd_netlink *rtnl, sd_netlink_message **ret, uint16_t type);
int message_new_empty(sd_netlink *rtnl, sd_netlink_message **ret);
int socket_open(int family);
int socket_bind(sd_netlink *nl);
int socket_broadcast_group_ref(sd_netlink *nl, unsigned group);
int socket_broadcast_group_unref(sd_netlink *nl, unsigned group);
int socket_write_message(sd_netlink *nl, sd_netlink_message *m);
int socket_read_message(sd_netlink *nl);
int rtnl_rqueue_make_room(sd_netlink *rtnl);
int rtnl_rqueue_partial_make_room(sd_netlink *rtnl);
/* Make sure callbacks don't destroy the rtnl connection */
#define NETLINK_DONT_DESTROY(rtnl) \
_cleanup_(sd_netlink_unrefp) _unused_ sd_netlink *_dont_destroy_##rtnl = sd_netlink_ref(rtnl)
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