5 net.h -- header for net.c
6 Copyright (C) 1998-2005 Ivo Timmermans
7 2000-2016 Guus Sliepen <guus@tinc-vpn.org>
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License along
20 with this program; if not, write to the Free Software Foundation, Inc.,
21 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
31 #define EPOLL_MAX_EVENTS_PER_LOOP 32
33 #ifdef ENABLE_JUMBOGRAMS
34 #define MTU 9018 /* 9000 bytes payload + 14 bytes ethernet header + 4 bytes VLAN tag */
36 #define MTU 1518 /* 1500 bytes payload + 14 bytes ethernet header + 4 bytes VLAN tag */
39 #define MINMTU 512 /* Below this we don't consider UDP to be working */
41 /* MAXSIZE is the maximum size of an encapsulated packet: MTU + seqno + srcid + dstid + padding + HMAC + compressor overhead */
42 #define MAXSIZE (MTU + 4 + sizeof(node_id_t) + sizeof(node_id_t) + CIPHER_MAX_BLOCK_SIZE + DIGEST_MAX_SIZE + MTU/64 + 20)
44 /* MAXBUFSIZE is the maximum size of a request: enough for a MAXSIZEd packet or a 8192 bits RSA key */
45 #define MAXBUFSIZE ((MAXSIZE > 2048 ? MAXSIZE : 2048) + 128)
47 #define MAXSOCKETS 8 /* Probably overkill... */
49 typedef struct mac_t {
53 typedef struct ipv4_t {
57 typedef struct ipv6_t {
61 typedef struct node_id_t {
65 typedef uint16_t length_t;
66 typedef uint32_t seqno_t;
68 #define AF_UNKNOWN 255
70 struct sockaddr_unknown {
78 typedef union sockaddr_t {
80 struct sockaddr_in in;
81 struct sockaddr_in6 in6;
82 struct sockaddr_unknown unknown;
86 #define SALEN(s) SA_LEN(&s)
88 #define SALEN(s) (s.sa_family==AF_INET?sizeof(struct sockaddr_in):sizeof(struct sockaddr_in6))
91 #define SEQNO(x) ((x)->data + (x)->offset - 4)
92 #define SRCID(x) ((node_id_t *)((x)->data + (x)->offset - 6))
93 #define DSTID(x) ((node_id_t *)((x)->data + (x)->offset - 12))
94 #define DATA(x) ((x)->data + (x)->offset)
95 #define DEFAULT_PACKET_OFFSET 12
97 typedef struct vpn_packet_t {
98 length_t len; /* The actual number of valid bytes in the `data' field (including seqno or dstid/srcid) */
99 length_t offset; /* Offset in the buffer where the packet data starts (righter after seqno or dstid/srcid) */
100 int priority; /* priority or TOS */
101 uint8_t data[MAXSIZE];
104 /* Packet types when using SPTPS */
106 #define PKT_COMPRESSED 1
110 typedef struct listen_socket_t {
121 typedef struct outgoing_t {
127 extern list_t outgoing_list;
129 extern int maxoutbufsize;
130 extern int seconds_till_retry;
131 extern int addressfamily;
132 extern unsigned replaywin;
133 extern bool localdiscovery;
135 extern bool udp_discovery;
136 extern int udp_discovery_keepalive_interval;
137 extern int udp_discovery_interval;
138 extern int udp_discovery_timeout;
140 extern int mtu_info_interval;
141 extern int udp_info_interval;
143 extern listen_socket_t listen_socket[MAXSOCKETS];
144 extern int listen_sockets;
145 extern io_t unix_socket;
146 extern int keylifetime;
147 extern int udp_rcvbuf;
148 extern int udp_sndbuf;
149 extern bool udp_rcvbuf_warnings;
150 extern bool udp_sndbuf_warnings;
151 extern int max_connection_burst;
153 extern bool do_prune;
155 extern bool device_standby;
156 extern bool autoconnect;
157 extern bool disablebuggypeers;
158 extern int contradicting_add_edge;
159 extern int contradicting_del_edge;
160 extern time_t last_config_check;
162 extern char *proxyhost;
163 extern char *proxyport;
164 extern char *proxyuser;
165 extern char *proxypass;
166 typedef enum proxytype_t {
174 extern proxytype_t proxytype;
176 extern char *scriptinterpreter;
177 extern char *scriptextension;
179 /* Yes, very strange placement indeed, but otherwise the typedefs get all tangled up */
180 #include "connection.h"
183 extern void retry_outgoing(outgoing_t *outgoing);
184 extern void handle_incoming_vpn_data(void *data, int flags);
185 extern void finish_connecting(struct connection_t *c);
186 extern bool do_outgoing_connection(struct outgoing_t *outgoing);
187 extern void handle_new_meta_connection(void *data, int flags);
188 extern void handle_new_unix_connection(void *data, int flags);
189 extern int setup_listen_socket(const sockaddr_t *sa);
190 extern int setup_vpn_in_socket(const sockaddr_t *sa);
191 extern bool send_sptps_data(struct node_t *to, struct node_t *from, int type, const void *data, size_t len);
192 extern bool receive_sptps_record(void *handle, uint8_t type, const void *data, uint16_t len);
193 extern void send_packet(struct node_t *n, vpn_packet_t *packet);
194 extern void receive_tcppacket(struct connection_t *c, const char *buffer, size_t length);
195 extern bool receive_tcppacket_sptps(struct connection_t *c, const char *buffer, size_t length);
196 extern void broadcast_packet(const struct node_t *n, vpn_packet_t *packet);
197 extern char *get_name(void);
198 extern void device_enable(void);
199 extern void device_disable(void);
200 extern bool setup_myself_reloadable(void);
201 extern bool setup_network(void);
202 extern void setup_outgoing_connection(struct outgoing_t *outgoing, bool verbose);
203 extern void try_outgoing_connections(void);
204 extern void close_network_connections(void);
205 extern int main_loop(void);
206 extern void terminate_connection(struct connection_t *c, bool report);
207 extern bool node_read_ecdsa_public_key(struct node_t *n);
208 extern void handle_device_data(void *data, int flags);
209 extern void handle_meta_connection_data(struct connection_t *c);
210 extern void regenerate_key(void);
211 extern void purge(void);
212 extern void retry(void);
213 extern int reload_configuration(void);
214 extern void load_all_nodes(void);
215 extern void try_tx(struct node_t *n, bool mtu);
216 extern void tarpit(int fd);
219 #define closesocket(s) close(s)