1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
|
/* SPDX-License-Identifier: LGPL-2.1-or-later */
#pragma once
#include <linux/netlink.h>
#include "sd-netlink.h"
#include "list.h"
#include "netlink-types.h"
#include "prioq.h"
#include "time-util.h"
#define NETLINK_DEFAULT_TIMEOUT_USEC ((usec_t) (25 * USEC_PER_SEC))
#define NETLINK_RQUEUE_MAX 64*1024
#define NETLINK_CONTAINER_DEPTH 32
struct reply_callback {
sd_netlink_message_handler_t callback;
usec_t timeout;
uint32_t serial;
unsigned prioq_idx;
};
struct match_callback {
sd_netlink_message_handler_t callback;
uint16_t type;
LIST_FIELDS(struct match_callback, match_callbacks);
};
typedef enum NetlinkSlotType {
NETLINK_REPLY_CALLBACK,
NETLINK_MATCH_CALLBACK,
_NETLINK_SLOT_INVALID = -EINVAL,
} NetlinkSlotType;
struct sd_netlink_slot {
unsigned n_ref;
NetlinkSlotType type:8;
bool floating;
sd_netlink *netlink;
void *userdata;
sd_netlink_destroy_t destroy_callback;
char *description;
LIST_FIELDS(sd_netlink_slot, slots);
union {
struct reply_callback reply_callback;
struct match_callback match_callback;
};
};
struct sd_netlink {
unsigned n_ref;
int fd;
union {
struct sockaddr sa;
struct sockaddr_nl nl;
} sockaddr;
int protocol;
Hashmap *broadcast_group_refs;
bool broadcast_group_dont_leave:1; /* until we can rely on 4.2 */
sd_netlink_message **rqueue;
unsigned rqueue_size;
sd_netlink_message **rqueue_partial;
unsigned rqueue_partial_size;
struct nlmsghdr *rbuffer;
bool processing:1;
uint32_t serial;
struct Prioq *reply_callbacks_prioq;
Hashmap *reply_callbacks;
LIST_HEAD(struct match_callback, match_callbacks);
LIST_HEAD(sd_netlink_slot, slots);
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;
Hashmap *genl_family_to_nlmsg_type;
Hashmap *nlmsg_type_to_genl_family;
};
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 {
unsigned n_ref;
int protocol;
struct nlmsghdr *hdr;
struct netlink_container containers[NETLINK_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_empty(sd_netlink *nl, sd_netlink_message **ret);
int message_new_full(
sd_netlink *nl,
uint16_t nlmsg_type,
const NLTypeSystem *type_system,
size_t header_size,
sd_netlink_message **ret);
int message_new(sd_netlink *nl, sd_netlink_message **ret, uint16_t type);
int message_new_synthetic_error(sd_netlink *nl, int error, uint32_t serial, sd_netlink_message **ret);
uint32_t message_get_serial(sd_netlink_message *m);
void message_seal(sd_netlink_message *m);
int netlink_open_family(sd_netlink **ret, int family);
bool netlink_pid_changed(sd_netlink *nl);
int netlink_rqueue_make_room(sd_netlink *nl);
int netlink_rqueue_partial_make_room(sd_netlink *nl);
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_writev_message(sd_netlink *nl, sd_netlink_message **m, size_t msgcount);
int socket_read_message(sd_netlink *nl);
/* Make sure callbacks don't destroy the netlink connection */
#define NETLINK_DONT_DESTROY(nl) \
_cleanup_(sd_netlink_unrefp) _unused_ sd_netlink *_dont_destroy_##nl = sd_netlink_ref(nl)
|
