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1 : /*
2 : * NS related header.
3 : * Copyright (C) 2014 6WIND S.A.
4 : *
5 : * This file is part of GNU Zebra.
6 : *
7 : * GNU Zebra is free software; you can redistribute it and/or modify
8 : * it under the terms of the GNU General Public License as published
9 : * by the Free Software Foundation; either version 2, or (at your
10 : * option) any later version.
11 : *
12 : * GNU Zebra is distributed in the hope that it will be useful, but
13 : * WITHOUT ANY WARRANTY; without even the implied warranty of
14 : * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 : * General Public License for more details.
16 : *
17 : * You should have received a copy of the GNU General Public License along
18 : * with this program; see the file COPYING; if not, write to the Free Software
19 : * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
20 : */
21 :
22 : #ifndef _ZEBRA_NS_H
23 : #define _ZEBRA_NS_H
24 :
25 : #include "openbsd-tree.h"
26 : #include "linklist.h"
27 : #include "vty.h"
28 :
29 : #ifdef __cplusplus
30 : extern "C" {
31 : #endif
32 :
33 : typedef uint32_t ns_id_t;
34 :
35 : /* the default NS ID */
36 : #define NS_UNKNOWN UINT32_MAX
37 :
38 : /* Default netns directory (Linux) */
39 : #define NS_RUN_DIR "/var/run/netns"
40 :
41 : #ifdef HAVE_NETNS
42 : #define NS_DEFAULT_NAME "/proc/self/ns/net"
43 : #else /* !HAVE_NETNS */
44 : #define NS_DEFAULT_NAME "default-netns"
45 : #endif /* HAVE_NETNS */
46 :
47 : struct ns {
48 : RB_ENTRY(ns) entry;
49 :
50 : /* Identifier, same as the vector index */
51 : ns_id_t ns_id;
52 :
53 : /* Identifier, mapped on the NSID value */
54 : ns_id_t internal_ns_id;
55 :
56 : /* Identifier, value of NSID of default netns,
57 : * relative value in that local netns
58 : */
59 : ns_id_t relative_default_ns;
60 :
61 : /* Name */
62 : char *name;
63 :
64 : /* File descriptor */
65 : int fd;
66 :
67 : /* Master list of interfaces belonging to this NS */
68 : struct list *iflist;
69 :
70 : /* Back Pointer to VRF */
71 : void *vrf_ctxt;
72 :
73 : /* User data */
74 : void *info;
75 : };
76 : RB_HEAD(ns_head, ns);
77 88 : RB_PROTOTYPE(ns_head, ns, entry, ns_compare)
78 :
79 : /*
80 : * API for managing NETNS. eg from zebra daemon
81 : * one want to manage the list of NETNS, etc...
82 : */
83 :
84 : /*
85 : * NS hooks
86 : */
87 :
88 : #define NS_NEW_HOOK 0 /* a new netns is just created */
89 : #define NS_DELETE_HOOK 1 /* a netns is to be deleted */
90 : #define NS_ENABLE_HOOK 2 /* a netns is ready to use */
91 : #define NS_DISABLE_HOOK 3 /* a netns is to be unusable */
92 :
93 : /*
94 : * Add a specific hook ns module.
95 : * @param1: hook type
96 : * @param2: the callback function
97 : * - param 1: the NS ID
98 : * - param 2: the address of the user data pointer (the user data
99 : * can be stored in or freed from there)
100 : */
101 : extern void ns_add_hook(int type, int (*)(struct ns *));
102 :
103 :
104 : /*
105 : * NS initializer/destructor
106 : */
107 :
108 : extern void ns_terminate(void);
109 :
110 : /* API to initialize NETNS managerment
111 : * parameter is the default ns_id
112 : */
113 : extern void ns_init_management(ns_id_t ns_id, ns_id_t internal_ns_idx);
114 :
115 :
116 : /*
117 : * NS utilities
118 : */
119 :
120 : /* Create a socket serving for the given NS
121 : */
122 : int ns_socket(int domain, int type, int protocol, ns_id_t ns_id);
123 :
124 : /* return the path of the NETNS */
125 : extern char *ns_netns_pathname(struct vty *vty, const char *name);
126 :
127 : /* Parse and execute a function on all the NETNS */
128 : #define NS_WALK_CONTINUE 0
129 : #define NS_WALK_STOP 1
130 :
131 : extern void ns_walk_func(int (*func)(struct ns *,
132 : void *,
133 : void **),
134 : void *param_in,
135 : void **param_out);
136 :
137 : /* API to get the NETNS name, from the ns pointer */
138 : extern const char *ns_get_name(struct ns *ns);
139 :
140 : /* only called from vrf ( when removing netns from vrf)
141 : * or at VRF termination
142 : */
143 : extern void ns_delete(struct ns *ns);
144 :
145 : /* return > 0 if netns is available
146 : * called by VRF to check netns backend is available for VRF
147 : */
148 : extern int ns_have_netns(void);
149 :
150 : /* API to get context information of a NS */
151 : extern void *ns_info_lookup(ns_id_t ns_id);
152 :
153 : /* API to map internal ns id value with
154 : * user friendly ns id external value
155 : */
156 : extern ns_id_t ns_map_nsid_with_external(ns_id_t ns_id, bool map);
157 :
158 : /*
159 : * NS init routine
160 : * should be called from backendx
161 : */
162 : extern void ns_init(void);
163 :
164 : #define NS_DEFAULT 0
165 :
166 : /* API that can be used to change from NS */
167 : extern int ns_switchback_to_initial(void);
168 : extern int ns_switch_to_netns(const char *netns_name);
169 :
170 : /*
171 : * NS handling routines.
172 : * called by modules that use NS backend
173 : */
174 :
175 : /* API to search for already present NETNS */
176 : extern struct ns *ns_lookup(ns_id_t ns_id);
177 : extern struct ns *ns_lookup_name(const char *name);
178 :
179 : /* API to handle NS : creation, enable, disable
180 : * for enable, a callback function is passed as parameter
181 : * the callback belongs to the module that uses NS as backend
182 : * upon enabling the NETNS, the upper layer is informed
183 : */
184 : extern int ns_enable(struct ns *ns, void (*func)(ns_id_t, void *));
185 : extern struct ns *ns_get_created(struct ns *ns, char *name, ns_id_t ns_id);
186 : extern ns_id_t ns_id_get_absolute(ns_id_t ns_id_reference, ns_id_t link_nsid);
187 : extern void ns_disable(struct ns *ns);
188 : extern struct ns *ns_get_default(void);
189 :
190 : #ifdef __cplusplus
191 : }
192 : #endif
193 :
194 : #endif /*_ZEBRA_NS_H*/
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