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nss-myhostname: move local address listing logic into shared, so that we can make...
[elogind.git] / src / libsystemd / sd-rtnl / rtnl-internal.h
1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
2
3 #pragma once
4
5 /***
6   This file is part of systemd.
7
8   Copyright 2013 Tom Gundersen <teg@jklm.no>
9
10   systemd is free software; you can redistribute it and/or modify it
11   under the terms of the GNU Lesser General Public License as published by
12   the Free Software Foundation; either version 2.1 of the License, or
13   (at your option) any later version.
14
15   systemd is distributed in the hope that it will be useful, but
16   WITHOUT ANY WARRANTY; without even the implied warranty of
17   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18   Lesser General Public License for more details.
19
20   You should have received a copy of the GNU Lesser General Public License
21   along with systemd; If not, see <http://www.gnu.org/licenses/>.
22 ***/
23
24 #include <linux/netlink.h>
25
26 #include "refcnt.h"
27 #include "prioq.h"
28 #include "list.h"
29
30 #include "sd-rtnl.h"
31
32 #include "rtnl-types.h"
33
34 #define RTNL_DEFAULT_TIMEOUT ((usec_t) (25 * USEC_PER_SEC))
35
36 #define RTNL_WQUEUE_MAX 1024
37 #define RTNL_RQUEUE_MAX 64*1024
38
39 #define RTNL_CONTAINER_DEPTH 32
40
41 struct reply_callback {
42         sd_rtnl_message_handler_t callback;
43         void *userdata;
44         usec_t timeout;
45         uint64_t serial;
46         unsigned prioq_idx;
47 };
48
49 struct match_callback {
50         sd_rtnl_message_handler_t callback;
51         uint16_t type;
52         void *userdata;
53
54         LIST_FIELDS(struct match_callback, match_callbacks);
55 };
56
57 struct sd_rtnl {
58         RefCount n_ref;
59
60         int fd;
61
62         union {
63                 struct sockaddr sa;
64                 struct sockaddr_nl nl;
65         } sockaddr;
66
67         sd_rtnl_message **rqueue;
68         unsigned rqueue_size;
69         size_t rqueue_allocated;
70
71         sd_rtnl_message **rqueue_partial;
72         unsigned rqueue_partial_size;
73         size_t rqueue_partial_allocated;
74
75         sd_rtnl_message **wqueue;
76         unsigned wqueue_size;
77         size_t wqueue_allocated;
78
79         struct nlmsghdr *rbuffer;
80         size_t rbuffer_allocated;
81
82         bool processing:1;
83
84         uint32_t serial;
85
86         struct Prioq *reply_callbacks_prioq;
87         Hashmap *reply_callbacks;
88
89         LIST_HEAD(struct match_callback, match_callbacks);
90
91         pid_t original_pid;
92
93         sd_event_source *io_event_source;
94         sd_event_source *time_event_source;
95         sd_event_source *exit_event_source;
96         sd_event *event;
97 };
98
99 struct sd_rtnl_message {
100         RefCount n_ref;
101
102         sd_rtnl *rtnl;
103
104         struct nlmsghdr *hdr;
105         const struct NLTypeSystem *(container_type_system[RTNL_CONTAINER_DEPTH]); /* the type of the container and all its parents */
106         size_t container_offsets[RTNL_CONTAINER_DEPTH]; /* offset from hdr to each container's start */
107         unsigned n_containers; /* number of containers */
108         size_t next_rta_offset; /* offset from hdr to next rta */
109         size_t *rta_offset_tb[RTNL_CONTAINER_DEPTH];
110         unsigned short rta_tb_size[RTNL_CONTAINER_DEPTH];
111         bool sealed:1;
112
113         sd_rtnl_message *next; /* next in a chain of multi-part messages */
114 };
115
116 int message_new(sd_rtnl *rtnl, sd_rtnl_message **ret, uint16_t type);
117
118 int socket_write_message(sd_rtnl *nl, sd_rtnl_message *m);
119 int socket_read_message(sd_rtnl *nl);
120
121 int rtnl_rqueue_make_room(sd_rtnl *rtnl);
122 int rtnl_rqueue_partial_make_room(sd_rtnl *rtnl);
123
124 int rtnl_message_read_internal(sd_rtnl_message *m, unsigned short type, void **data);
125 int rtnl_message_parse(sd_rtnl_message *m,
126                        size_t **rta_offset_tb,
127                        unsigned short *rta_tb_size,
128                        int max,
129                        struct rtattr *rta,
130                        unsigned int rt_len);
131
132 /* Make sure callbacks don't destroy the rtnl connection */
133 #define RTNL_DONT_DESTROY(rtnl) \
134         _cleanup_rtnl_unref_ _unused_ sd_rtnl *_dont_destroy_##rtnl = sd_rtnl_ref(rtnl)