1 | /* |
1 | /* |
2 | connection.h -- header for connection.C |
2 | connection.h -- header for connection.C |
3 | Copyright (C) 2003-2004 Marc Lehmann <pcg@goof.com> |
3 | Copyright (C) 2003-2005 Marc Lehmann <gvpe@schmorp.de> |
4 | |
4 | |
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5 | This file is part of GVPE. |
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6 | |
5 | This program is free software; you can redistribute it and/or modify |
7 | GVPE is free software; you can redistribute it and/or modify |
6 | it under the terms of the GNU General Public License as published by |
8 | it under the terms of the GNU General Public License as published by |
7 | the Free Software Foundation; either version 2 of the License, or |
9 | the Free Software Foundation; either version 2 of the License, or |
8 | (at your option) any later version. |
10 | (at your option) any later version. |
9 | |
11 | |
10 | This program is distributed in the hope that it will be useful, |
12 | This program is distributed in the hope that it will be useful, |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
13 | GNU General Public License for more details. |
15 | GNU General Public License for more details. |
14 | |
16 | |
15 | You should have received a copy of the GNU General Public License |
17 | You should have received a copy of the GNU General Public License |
16 | along with this program; if not, write to the Free Software |
18 | along with gvpe; if not, write to the Free Software |
17 | Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
19 | Foundation, Inc. 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
18 | */ |
20 | */ |
19 | |
21 | |
20 | #ifndef VPE_CONNECTION_H__ |
22 | #ifndef GVPE_CONNECTION_H__ |
21 | #define VPE_CONNECTION_H__ |
23 | #define GVPE_CONNECTION_H__ |
22 | |
24 | |
23 | #include <openssl/hmac.h> |
25 | #include <openssl/hmac.h> |
24 | |
26 | |
25 | #include "global.h" |
27 | #include "global.h" |
26 | #include "conf.h" |
28 | #include "conf.h" |
… | |
… | |
31 | struct vpn; |
33 | struct vpn; |
32 | |
34 | |
33 | // called after HUP etc. to (re-)initialize global data structures |
35 | // called after HUP etc. to (re-)initialize global data structures |
34 | void connection_init (); |
36 | void connection_init (); |
35 | |
37 | |
36 | struct rsaid { |
38 | struct rsaid |
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39 | { |
37 | u8 id[RSA_IDLEN]; // the challenge id |
40 | u8 id[RSA_IDLEN]; // the challenge id |
38 | }; |
41 | }; |
39 | |
42 | |
40 | typedef rsaclear rsachallenge; // challenge data; |
43 | typedef rsaclear rsachallenge; // challenge data; |
41 | typedef rsacrypt rsaencrdata; // encrypted challenge |
44 | typedef rsacrypt rsaencrdata; // encrypted challenge |
… | |
… | |
57 | |
60 | |
58 | void hmac_gen (crypto_ctx * ctx); |
61 | void hmac_gen (crypto_ctx * ctx); |
59 | }; |
62 | }; |
60 | |
63 | |
61 | struct vpn_packet : hmac_packet |
64 | struct vpn_packet : hmac_packet |
62 | { |
65 | { |
63 | enum ptype |
66 | enum ptype |
64 | { |
67 | { |
65 | PT_RESET = 0, |
68 | PT_RESET = 0, |
66 | PT_DATA_UNCOMPRESSED, |
69 | PT_DATA_UNCOMPRESSED, |
67 | PT_DATA_COMPRESSED, |
70 | PT_DATA_COMPRESSED, |
68 | PT_PING, PT_PONG, // wasting namespace space? ;) |
71 | PT_PING, PT_PONG, // wasting namespace space? ;) |
69 | PT_AUTH_REQ, // authentification request |
72 | PT_AUTH_REQ, // authentification request |
70 | PT_AUTH_RES, // authentification response |
73 | PT_AUTH_RES, // authentification response |
71 | PT_CONNECT_REQ, // want other host to contact me |
74 | PT_CONNECT_REQ, // want other node to contact me |
72 | PT_CONNECT_INFO, // request connection to some node |
75 | PT_CONNECT_INFO, // request connection to some node |
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76 | PT_DATA_BRIDGED, // uncompressed packet with foreign mac pot. larger than path mtu |
73 | PT_MAX |
77 | PT_MAX |
74 | }; |
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75 | |
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76 | u8 type; |
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77 | u8 srcdst, src1, dst1; |
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78 | |
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79 | void set_hdr (ptype type_, unsigned int dst); |
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80 | |
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81 | unsigned int src () const |
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82 | { |
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83 | return src1 | ((srcdst >> 4) << 8); |
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84 | } |
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85 | |
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86 | unsigned int dst () const |
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87 | { |
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88 | return dst1 | ((srcdst & 0xf) << 8); |
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89 | } |
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90 | |
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91 | ptype typ () const |
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92 | { |
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93 | return (ptype) type; |
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94 | } |
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95 | }; |
78 | }; |
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79 | |
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80 | u8 type; |
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81 | u8 srcdst, src1, dst1; |
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82 | |
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83 | void set_hdr (ptype type_, unsigned int dst); |
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84 | |
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85 | unsigned int src () const |
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86 | { |
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87 | return src1 | ((srcdst >> 4) << 8); |
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88 | } |
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89 | |
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90 | unsigned int dst () const |
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91 | { |
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92 | return dst1 | ((srcdst & 0xf) << 8); |
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93 | } |
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94 | |
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95 | ptype typ () const |
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96 | { |
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97 | return (ptype) type; |
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98 | } |
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99 | }; |
96 | |
100 | |
97 | //////////////////////////////////////////////////////////////////////////////////////// |
101 | //////////////////////////////////////////////////////////////////////////////////////// |
98 | |
102 | |
99 | // a very simple fifo pkt-queue |
103 | // a very simple fifo pkt-queue |
100 | class pkt_queue |
104 | class pkt_queue |
101 | { |
105 | { |
102 | net_packet *queue[QUEUEDEPTH]; |
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103 | int i, j; |
106 | int i, j; |
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107 | int max_queue; |
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108 | double max_ttl; |
104 | |
109 | |
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110 | struct pkt { |
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111 | ev_tstamp tstamp; |
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112 | net_packet *pkt; |
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113 | } *queue; |
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114 | |
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115 | void expire_cb (ev::timer &w, int revents); ev::timer expire; |
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116 | |
105 | public: |
117 | public: |
106 | |
118 | |
107 | void put (net_packet *p); |
119 | void put (net_packet *p); |
108 | net_packet *get (); |
120 | net_packet *get (); |
109 | |
121 | |
110 | pkt_queue (); |
122 | bool empty () |
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123 | { |
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124 | return i == j; |
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125 | } |
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126 | |
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127 | pkt_queue (double max_ttl, int max_queue); |
111 | ~pkt_queue (); |
128 | ~pkt_queue (); |
112 | }; |
129 | }; |
113 | |
130 | |
114 | enum |
131 | enum |
115 | { |
132 | { |
116 | FEATURE_COMPRESSION = 0x01, |
133 | FEATURE_COMPRESSION = 0x01, |
117 | FEATURE_ROHC = 0x02, |
134 | FEATURE_ROHC = 0x02, |
118 | }; |
135 | FEATURE_BRIDGING = 0x04, |
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136 | }; |
119 | |
137 | |
120 | struct connection |
138 | struct connection |
121 | { |
139 | { |
122 | conf_node *conf; |
140 | conf_node *conf; |
123 | struct vpn *vpn; |
141 | struct vpn *vpn; |
124 | |
142 | |
125 | sockinfo si; // the current(!) destination ip to send packets to |
143 | sockinfo si; // the current(!) destination ip to send packets to |
126 | int retry_cnt; |
144 | int retry_cnt; |
127 | |
145 | |
128 | tstamp last_activity; // time of last packet received |
146 | tstamp last_activity; // time of last packet received |
129 | |
147 | |
130 | u32 oseqno; |
148 | u32 oseqno; |
131 | sliding_window iseqno; |
149 | sliding_window iseqno; |
132 | |
150 | |
133 | u8 protocol; |
151 | u8 protocol; |
134 | u8 features; |
152 | u8 features; |
135 | |
153 | |
136 | pkt_queue data_queue, vpn_queue; |
154 | pkt_queue data_queue, vpn_queue; |
137 | |
155 | |
138 | crypto_ctx *octx, *ictx; |
156 | crypto_ctx *octx, *ictx; |
139 | |
157 | |
140 | enum conf_node::connectmode connectmode; |
158 | #if ENABLE_DNS |
141 | u8 prot_minor; // minor number of other side |
159 | struct dns_connection *dns; |
142 | |
160 | |
143 | void reset_si (); |
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144 | const sockinfo &forward_si (const sockinfo &si) const; |
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145 | |
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146 | void shutdown (); |
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147 | void connection_established (); |
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148 | void reset_connection (); |
161 | void dnsv4_reset_connection (); |
149 | |
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150 | void establish_connection_cb (time_watcher &w); time_watcher establish_connection; |
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151 | void rekey_cb (time_watcher &w); time_watcher rekey; // next rekying (actually current reset + reestablishing) |
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152 | void keepalive_cb (time_watcher &w); time_watcher keepalive; // next keepalive probe |
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153 | |
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154 | void send_connect_request (int id); |
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155 | void send_auth_request (const sockinfo &si, bool initiate); |
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156 | void send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg); |
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157 | void send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols); |
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158 | void send_reset (const sockinfo &dsi); |
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159 | void send_ping (const sockinfo &dsi, u8 pong = 0); |
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160 | void send_data_packet (tap_packet *pkt); |
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161 | |
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162 | void inject_data_packet (tap_packet *pkt, bool broadcast = false); |
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163 | void inject_vpn_packet (vpn_packet *pkt, int tos = 0); // for forwarding |
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164 | |
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165 | void send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos = 0); |
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166 | void recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi); |
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167 | |
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168 | void script_node (); |
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169 | const char *script_node_up (); |
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170 | const char *script_node_down (); |
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171 | |
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172 | void dump_status (); |
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173 | |
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174 | connection(struct vpn *vpn_); |
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175 | ~connection (); |
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176 | }; |
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177 | |
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178 | #endif |
162 | #endif |
179 | |
163 | |
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164 | enum conf_node::connectmode connectmode; |
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165 | u8 prot_minor; // minor number of other side |
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166 | |
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167 | void reset_si (); |
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168 | const sockinfo &forward_si (const sockinfo &si) const; |
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169 | |
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170 | void shutdown (); |
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171 | void connection_established (); |
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172 | void reset_connection (); |
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173 | |
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174 | void establish_connection_cb (ev::timer &w, int revents); ev::timer establish_connection; |
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175 | void rekey_cb (ev::timer &w, int revents); ev::timer rekey; // next rekying (actually current reset + reestablishing) |
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176 | void keepalive_cb (ev::timer &w, int revents); ev::timer keepalive; // next keepalive probe |
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177 | |
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178 | void send_connect_request (int id); |
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179 | void send_auth_request (const sockinfo &si, bool initiate); |
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180 | void send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg); |
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181 | void send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols); |
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182 | void send_reset (const sockinfo &dsi); |
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183 | void send_ping (const sockinfo &dsi, u8 pong = 0); |
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184 | void send_data_packet (tap_packet *pkt); |
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185 | |
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186 | void inject_data_packet (tap_packet *pkt, bool broadcast = false); |
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187 | void inject_vpn_packet (vpn_packet *pkt, int tos = 0); // for forwarding |
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188 | |
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189 | void recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi); |
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190 | void send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos = 0); |
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191 | |
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192 | void script_init_env (const char *ext); |
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193 | void script_init_connect_env (); |
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194 | const char *script_node_up (); |
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195 | const char *script_node_down (); |
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196 | |
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197 | void dump_status (); |
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198 | |
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199 | connection (struct vpn *vpn, conf_node *conf); |
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200 | ~connection (); |
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201 | }; |
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202 | |
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203 | #endif |
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204 | |