Annotation of embedaddon/strongswan/src/libcharon/plugins/kernel_netlink/kernel_netlink_shared.h, revision 1.1.1.1
1.1 misho 1: /*
2: * Copyright (C) 2008-2020 Tobias Brunner
3: * HSR Hochschule fuer Technik Rapperswil
4: *
5: * This program is free software; you can redistribute it and/or modify it
6: * under the terms of the GNU General Public License as published by the
7: * Free Software Foundation; either version 2 of the License, or (at your
8: * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
9: *
10: * This program is distributed in the hope that it will be useful, but
11: * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
12: * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13: * for more details.
14: */
15:
16: #ifndef KERNEL_NETLINK_SHARED_H_
17: #define KERNEL_NETLINK_SHARED_H_
18:
19: #include <library.h>
20:
21: #include <linux/rtnetlink.h>
22:
23: /**
24: * Default buffer size.
25: *
26: * 1024 byte is currently sufficient for all operations.
27: */
28: #ifndef KERNEL_NETLINK_BUFSIZE
29: #define KERNEL_NETLINK_BUFSIZE 1024
30: #endif
31:
32: /**
33: * General purpose netlink buffer.
34: *
35: * Some platforms require an enforced alignment to four bytes (e.g. ARM).
36: */
37: typedef union {
38: struct nlmsghdr hdr;
39: u_char bytes[KERNEL_NETLINK_BUFSIZE];
40: } netlink_buf_t __attribute__((aligned(RTA_ALIGNTO)));
41:
42: typedef struct netlink_socket_t netlink_socket_t;
43:
44: /**
45: * Wrapper around a netlink socket.
46: */
47: struct netlink_socket_t {
48:
49: /**
50: * Send a netlink message and wait for a reply.
51: *
52: * @param in netlink message to send
53: * @param out received netlink message
54: * @param out_len length of the received message
55: */
56: status_t (*send)(netlink_socket_t *this, struct nlmsghdr *in,
57: struct nlmsghdr **out, size_t *out_len);
58:
59: /**
60: * Send a netlink message and wait for its acknowledge.
61: *
62: * @param in netlink message to send
63: */
64: status_t (*send_ack)(netlink_socket_t *this, struct nlmsghdr *in);
65:
66: /**
67: * Destroy the socket.
68: */
69: void (*destroy)(netlink_socket_t *this);
70: };
71:
72: /**
73: * Create a netlink_socket_t object.
74: *
75: * @param protocol protocol type (e.g. NETLINK_XFRM or NETLINK_ROUTE)
76: * @param names optional enum names for Netlink messages
77: * @param parallel support parallel queries on this Netlink socket
78: */
79: netlink_socket_t *netlink_socket_create(int protocol, enum_name_t *names,
80: bool parallel);
81:
82: /**
83: * Creates an rtattr and adds it to the given netlink message.
84: *
85: * @param hdr netlink message
86: * @param rta_type type of the rtattr
87: * @param data data to add to the rtattr
88: * @param buflen length of the netlink message buffer
89: */
90: void netlink_add_attribute(struct nlmsghdr *hdr, int rta_type, chunk_t data,
91: size_t buflen);
92:
93: /**
94: * Creates an rtattr under which other rtattrs are nested to the given netlink
95: * message.
96: *
97: * The returned pointer has to be passed to netlink_nested_end() after the
98: * nested attributes have been added to the message.
99: *
100: * @param hdr netlink message
101: * @param buflen size of full netlink buffer
102: * @param type RTA type
103: * @return attribute pointer
104: */
105: void *netlink_nested_start(struct nlmsghdr *hdr, size_t buflen, int type);
106:
107: /**
108: * Updates the length of the given attribute after nested attributes were added.
109: *
110: * @param hdr netlink message
111: * @param attr attribute returned from netlink_nested_start()
112: */
113: void netlink_nested_end(struct nlmsghdr *hdr, void *attr);
114:
115: /**
116: * Reserve space in a netlink message for given size and type, returning buffer.
117: *
118: * @param hdr netlink message
119: * @param buflen size of full netlink buffer
120: * @param type RTA type
121: * @param len length of RTA data
122: * @return buffer to len bytes of attribute data, NULL on error
123: */
124: void* netlink_reserve(struct nlmsghdr *hdr, int buflen, int type, int len);
125:
126: /**
127: * Determine buffer size for received messages (e.g. events).
128: *
129: * @return buffer size
130: */
131: u_int netlink_get_buflen();
132:
133: /**
134: * Information about an installed route.
135: */
136: struct route_entry_t {
137:
138: /** Destination net */
139: chunk_t dst_net;
140:
141: /** Destination net prefix length */
142: uint8_t prefixlen;
143:
144: /** Name of the interface the route is bound to (optional) */
145: char *if_name;
146:
147: /** Source IP of the route (virtual IP or %any) */
148: host_t *src_ip;
149:
150: /** Gateway for this route (optional) */
151: host_t *gateway;
152:
153: /** Whether the route was installed for a passthrough policy */
154: bool pass;
155: };
156:
157: typedef struct route_entry_t route_entry_t;
158:
159: /**
160: * Destroy a route entry.
161: */
162: void route_entry_destroy(route_entry_t *this);
163:
164: /**
165: * Clone a route entry.
166: */
167: route_entry_t *route_entry_clone(const route_entry_t *this);
168:
169: /**
170: * Hash a route entry (note that this only hashes the destination).
171: */
172: u_int route_entry_hash(const route_entry_t *this);
173:
174: /**
175: * Compare two route entries.
176: */
177: bool route_entry_equals(const route_entry_t *a, const route_entry_t *b);
178:
179: #endif /* KERNEL_NETLINK_SHARED_H_ */
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