1 | /* |
1 | /* |
2 | connection.h -- header for connection.C |
2 | connection.h -- header for connection.C |
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3 | Copyright (C) 2003-2005 Marc Lehmann <gvpe@schmorp.de> |
3 | |
4 | |
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5 | This file is part of GVPE. |
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6 | |
4 | This program is free software; you can redistribute it and/or modify |
7 | GVPE is free software; you can redistribute it and/or modify |
5 | 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 |
6 | the Free Software Foundation; either version 2 of the License, or |
9 | the Free Software Foundation; either version 2 of the License, or |
7 | (at your option) any later version. |
10 | (at your option) any later version. |
8 | |
11 | |
9 | 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, |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
12 | GNU General Public License for more details. |
15 | GNU General Public License for more details. |
13 | |
16 | |
14 | 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 |
15 | along with this program; if not, write to the Free Software |
18 | along with gvpe; if not, write to the Free Software |
16 | 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 |
17 | */ |
20 | */ |
18 | |
21 | |
19 | #ifndef VPE_CONNECTION_H__ |
22 | #ifndef GVPE_CONNECTION_H__ |
20 | #define VPE_CONNECTION_H__ |
23 | #define GVPE_CONNECTION_H__ |
21 | |
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22 | #include <netinet/ip.h> // for tos etc. |
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23 | |
24 | |
24 | #include <openssl/hmac.h> |
25 | #include <openssl/hmac.h> |
25 | |
26 | |
26 | #include "global.h" |
27 | #include "global.h" |
27 | #include "conf.h" |
28 | #include "conf.h" |
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32 | struct vpn; |
33 | struct vpn; |
33 | |
34 | |
34 | // called after HUP etc. to (re-)initialize global data structures |
35 | // called after HUP etc. to (re-)initialize global data structures |
35 | void connection_init (); |
36 | void connection_init (); |
36 | |
37 | |
37 | struct rsaid { |
38 | struct rsaid |
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39 | { |
38 | u8 id[RSA_IDLEN]; // the challenge id |
40 | u8 id[RSA_IDLEN]; // the challenge id |
39 | }; |
41 | }; |
40 | |
42 | |
41 | typedef u8 rsachallenge[RSA_KEYLEN - RSA_OVERHEAD]; // challenge data; |
43 | typedef rsaclear rsachallenge; // challenge data; |
42 | typedef u8 rsaencrdata[RSA_KEYLEN]; // encrypted challenge |
44 | typedef rsacrypt rsaencrdata; // encrypted challenge |
43 | typedef u8 rsaresponse[RSA_RESLEN]; // the encrypted ripemd160 hash |
45 | typedef u8 rsaresponse[RSA_RESLEN]; // the encrypted ripemd160 hash |
44 | |
46 | |
45 | //////////////////////////////////////////////////////////////////////////////////////// |
47 | //////////////////////////////////////////////////////////////////////////////////////// |
46 | |
48 | |
47 | struct crypto_ctx; |
49 | struct crypto_ctx; |
48 | |
50 | |
49 | struct hmac_packet:net_packet |
51 | struct hmac_packet : net_packet |
50 | { |
52 | { |
51 | u8 hmac[HMACLENGTH]; // each and every packet has a hmac field, but that is not (yet) checked everywhere |
53 | u8 hmac[HMACLENGTH]; // each and every packet has a hmac field, but that is not (yet) checked everywhere |
52 | |
54 | |
53 | void hmac_set (crypto_ctx * ctx); |
55 | void hmac_set (crypto_ctx * ctx); |
54 | bool hmac_chk (crypto_ctx * ctx); |
56 | bool hmac_chk (crypto_ctx * ctx); |
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… | |
58 | |
60 | |
59 | void hmac_gen (crypto_ctx * ctx); |
61 | void hmac_gen (crypto_ctx * ctx); |
60 | }; |
62 | }; |
61 | |
63 | |
62 | struct vpn_packet : hmac_packet |
64 | struct vpn_packet : hmac_packet |
63 | { |
65 | { |
64 | enum ptype |
66 | enum ptype |
65 | { |
67 | { |
66 | PT_RESET = 0, |
68 | PT_RESET = 0, |
67 | PT_DATA_UNCOMPRESSED, |
69 | PT_DATA_UNCOMPRESSED, |
68 | PT_DATA_COMPRESSED, |
70 | PT_DATA_COMPRESSED, |
69 | PT_PING, PT_PONG, // wasting namespace space? ;) |
71 | PT_PING, PT_PONG, // wasting namespace space? ;) |
70 | PT_AUTH_REQ, // authentification request |
72 | PT_AUTH_REQ, // authentification request |
71 | PT_AUTH_RES, // authentification response |
73 | PT_AUTH_RES, // authentification response |
72 | PT_CONNECT_REQ, // want other host to contact me |
74 | PT_CONNECT_REQ, // want other node to contact me |
73 | 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 |
74 | PT_MAX |
77 | PT_MAX |
75 | }; |
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76 | |
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77 | u8 type; |
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78 | u8 srcdst, src1, dst1; |
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79 | |
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80 | void set_hdr (ptype type, unsigned int dst); |
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81 | |
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82 | unsigned int src () const |
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83 | { |
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84 | return src1 | ((srcdst >> 4) << 8); |
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85 | } |
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86 | |
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87 | unsigned int dst () const |
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88 | { |
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89 | return dst1 | ((srcdst & 0xf) << 8); |
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90 | } |
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91 | |
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92 | ptype typ () const |
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93 | { |
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94 | return (ptype) type; |
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95 | } |
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96 | }; |
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 | }; |
97 | |
100 | |
98 | //////////////////////////////////////////////////////////////////////////////////////// |
101 | //////////////////////////////////////////////////////////////////////////////////////// |
99 | |
102 | |
100 | // a very simple fifo pkt-queue |
103 | // a very simple fifo pkt-queue |
101 | class pkt_queue |
104 | class pkt_queue |
102 | { |
105 | { |
103 | tap_packet *queue[QUEUEDEPTH]; |
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104 | int i, j; |
106 | int i, j; |
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107 | int max_queue; |
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108 | double max_ttl; |
105 | |
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 | |
106 | public: |
117 | public: |
107 | |
118 | |
108 | void put (tap_packet *p); |
119 | void put (net_packet *p); |
109 | tap_packet *get (); |
120 | net_packet *get (); |
110 | |
121 | |
111 | 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); |
112 | ~pkt_queue (); |
128 | ~pkt_queue (); |
113 | }; |
129 | }; |
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130 | |
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131 | enum |
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132 | { |
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133 | FEATURE_COMPRESSION = 0x01, |
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134 | FEATURE_ROHC = 0x02, |
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135 | FEATURE_BRIDGING = 0x04, |
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136 | }; |
114 | |
137 | |
115 | struct connection |
138 | struct connection |
116 | { |
139 | { |
117 | conf_node *conf; |
140 | conf_node *conf; |
118 | struct vpn *vpn; |
141 | struct vpn *vpn; |
119 | |
142 | |
120 | sockinfo si; // the current(!) destination ip to send packets to |
143 | sockinfo si; // the current(!) destination ip to send packets to |
121 | int retry_cnt; |
144 | int retry_cnt; |
122 | |
145 | |
123 | tstamp last_activity; // time of last packet received |
146 | tstamp last_activity; // time of last packet received |
124 | |
147 | |
125 | u32 oseqno; |
148 | u32 oseqno; |
126 | sliding_window iseqno; |
149 | sliding_window iseqno; |
127 | |
150 | |
128 | u8 protocol; |
151 | u8 protocol; |
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152 | u8 features; |
129 | |
153 | |
130 | pkt_queue queue; |
154 | pkt_queue data_queue, vpn_queue; |
131 | |
155 | |
132 | crypto_ctx *octx, *ictx; |
156 | crypto_ctx *octx, *ictx; |
133 | |
157 | |
134 | enum conf_node::connectmode connectmode; |
158 | #if ENABLE_DNS |
135 | u8 prot_minor; // minor number of other side |
159 | struct dns_connection *dns; |
136 | |
160 | |
137 | void reset_dstaddr (); |
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138 | |
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139 | void shutdown (); |
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140 | void reset_connection (); |
161 | void dnsv4_reset_connection (); |
141 | void establish_connection_cb (tstamp &ts); time_watcher establish_connection; |
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142 | void rekey_cb (tstamp &ts); time_watcher rekey; // next rekying (actually current reset + reestablishing) |
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143 | void keepalive_cb (tstamp &ts); time_watcher keepalive; // next keepalive probe |
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144 | |
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145 | void send_auth_request (const sockinfo &si, bool initiate); |
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146 | void send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg); |
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147 | void send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols); |
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148 | void send_reset (const sockinfo &dsi); |
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149 | void send_ping (const sockinfo &dsi, u8 pong = 0); |
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150 | void send_data_packet (tap_packet *pkt, bool broadcast = false); |
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151 | void inject_data_packet (tap_packet *pkt, bool broadcast = false); |
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152 | void connect_request (int id); |
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153 | |
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154 | void send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos = IPTOS_RELIABILITY); |
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155 | void recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi); |
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156 | |
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157 | void script_node (); |
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158 | const char *script_node_up (int); |
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159 | const char *script_node_down (int); |
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160 | |
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161 | void dump_status (); |
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162 | |
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163 | connection(struct vpn *vpn_); |
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164 | ~connection (); |
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165 | }; |
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166 | |
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167 | #endif |
162 | #endif |
168 | |
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 | |