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Comparing gvpe/src/connection.h (file contents):
Revision 1.3 by pcg, Wed Apr 2 05:15:00 2003 UTC vs.
Revision 1.31 by pcg, Thu Aug 7 17:30:28 2008 UTC

1/* 1/*
2 connection.h -- header for connection.C 2 connection.h -- header for connection.C
3 Copyright (C) 2003-2005 Marc Lehmann <gvpe@schmorp.de>
3 4
5 This file is part of GVPE.
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
22#include <netinet/ip.h> // for tos etc.
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"
… …
32struct vpn; 33struct 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
35void connection_init (); 36void connection_init ();
36 37
37struct rsaid { 38struct rsaid
39{
38 u8 id[RSA_IDLEN]; // the challenge id 40 u8 id[RSA_IDLEN]; // the challenge id
39}; 41};
40 42
41typedef u8 rsachallenge[RSA_KEYLEN - RSA_OVERHEAD]; // challenge data; 43typedef rsaclear rsachallenge; // challenge data;
42typedef u8 rsaencrdata[RSA_KEYLEN]; // encrypted challenge 44typedef rsacrypt rsaencrdata; // encrypted challenge
43typedef u8 rsaresponse[RSA_RESLEN]; // the encrypted ripemd160 hash 45typedef u8 rsaresponse[RSA_RESLEN]; // the encrypted ripemd160 hash
44 46
45//////////////////////////////////////////////////////////////////////////////////////// 47////////////////////////////////////////////////////////////////////////////////////////
46 48
47struct crypto_ctx; 49struct crypto_ctx;
48 50
49struct hmac_packet:net_packet 51struct 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);
… …
58 60
59 void hmac_gen (crypto_ctx * ctx); 61 void hmac_gen (crypto_ctx * ctx);
60}; 62};
61 63
62struct vpn_packet : hmac_packet 64struct 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
76 PT_DATA_BRIDGED, // uncompressed packet with foreign mac pot. larger than path mtu (NYI)
74 PT_MAX 77 PT_MAX
75 };
76
77 u8 type;
78 u8 srcdst, src1, dst1;
79
80 void set_hdr (ptype type, unsigned int dst);
81
82 unsigned int src () const
83 {
84 return src1 | ((srcdst >> 4) << 8);
85 }
86
87 unsigned int dst () const
88 {
89 return dst1 | ((srcdst & 0xf) << 8);
90 }
91
92 ptype typ () const
93 {
94 return (ptype) type;
95 }
96 }; 78 };
79
80 u8 type;
81 u8 srcdst, src1, dst1;
82
83 void set_hdr (ptype type_, unsigned int dst);
84
85 unsigned int src () const
86 {
87 return src1 | ((srcdst >> 4) << 8);
88 }
89
90 unsigned int dst () const
91 {
92 return dst1 | ((srcdst & 0xf) << 8);
93 }
94
95 ptype typ () const
96 {
97 return (ptype) type;
98 }
99};
97 100
98//////////////////////////////////////////////////////////////////////////////////////// 101////////////////////////////////////////////////////////////////////////////////////////
99 102
100// a very simple fifo pkt-queue 103// a very simple fifo pkt-queue
101class pkt_queue 104class pkt_queue
102 { 105{
103 tap_packet *queue[QUEUEDEPTH];
104 int i, j; 106 int i, j;
107 int max_queue;
108 double max_ttl;
105 109
110 struct pkt {
111 ev_tstamp tstamp;
112 net_packet *pkt;
113 } *queue;
114
115 void expire_cb (ev::timer &w, int revents); ev::timer expire;
116
106 public: 117public:
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 ()
123 {
124 return i == j;
125 }
126
127 pkt_queue (double max_ttl, int max_queue);
112 ~pkt_queue (); 128 ~pkt_queue ();
113 }; 129};
130
131enum
132{
133 FEATURE_COMPRESSION = 0x01,
134 FEATURE_ROHC = 0x02,
135 FEATURE_BRIDGING = 0x04,
136};
114 137
115struct connection 138struct 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
147 tstamp last_establish_attempt;
124 148
125 u32 oseqno; 149 u32 oseqno;
126 sliding_window iseqno; 150 sliding_window iseqno;
127 151
128 u8 protocol; 152 u8 protocol;
153 u8 features;
129 154
130 pkt_queue queue; 155 pkt_queue data_queue, vpn_queue;
131 156
132 crypto_ctx *octx, *ictx; 157 crypto_ctx *octx, *ictx;
133 158
134 enum conf_node::connectmode connectmode; 159#if ENABLE_DNS
135 u8 prot_minor; // minor number of other side 160 struct dns_connection *dns;
136 161
137 void reset_dstaddr ();
138
139 void shutdown ();
140 void reset_connection (); 162 void dnsv4_reset_connection ();
141 void establish_connection_cb (tstamp &ts); time_watcher establish_connection;
142 void rekey_cb (tstamp &ts); time_watcher rekey; // next rekying (actually current reset + reestablishing)
143 void keepalive_cb (tstamp &ts); time_watcher keepalive; // next keepalive probe
144
145 void send_auth_request (const sockinfo &si, bool initiate);
146 void send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg);
147 void send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols);
148 void send_reset (const sockinfo &dsi);
149 void send_ping (const sockinfo &dsi, u8 pong = 0);
150 void send_data_packet (tap_packet *pkt, bool broadcast = false);
151 void inject_data_packet (tap_packet *pkt, bool broadcast = false);
152 void connect_request (int id);
153
154 void send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos = IPTOS_RELIABILITY);
155 void recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi);
156
157 void script_node ();
158 const char *script_node_up ();
159 const char *script_node_down ();
160
161 void dump_status ();
162
163 connection(struct vpn *vpn_);
164 ~connection ();
165 };
166
167#endif 163#endif
168 164
165 enum conf_node::connectmode connectmode;
166 u8 prot_minor; // minor number of other side
167
168 void reset_si ();
169 const sockinfo &forward_si (const sockinfo &si) const;
170
171 void shutdown ();
172 void connection_established ();
173 void reset_connection ();
174
175 void establish_connection_cb (ev::timer &w, int revents); ev::timer establish_connection;
176 void rekey_cb (ev::timer &w, int revents); ev::timer rekey; // next rekying (actually current reset + reestablishing)
177 void keepalive_cb (ev::timer &w, int revents); ev::timer keepalive; // next keepalive probe
178
179 void send_connect_request (int id);
180 void send_auth_request (const sockinfo &si, bool initiate);
181 void send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg);
182 void send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols);
183 void send_reset (const sockinfo &dsi);
184 void send_ping (const sockinfo &dsi, u8 pong = 0);
185 void send_data_packet (tap_packet *pkt);
186
187 void post_inject_queue ();
188 void inject_data_packet (tap_packet *pkt);
189 void inject_vpn_packet (vpn_packet *pkt, int tos = 0); // for forwarding
190
191 void recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi);
192 void send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos = 0);
193
194 void script_init_env (const char *ext);
195 void script_init_connect_env ();
196 const char *script_node_up ();
197 const char *script_node_down ();
198
199 void dump_status ();
200
201 connection (struct vpn *vpn, conf_node *conf);
202 ~connection ();
203};
204
205#endif
206

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