| 1 |
/* |
| 2 |
connection.h -- header for connection.C |
| 3 |
Copyright (C) 2003 Marc Lehmann <pcg@goof.com> |
| 4 |
|
| 5 |
This program is free software; you can redistribute it and/or modify |
| 6 |
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 |
| 8 |
(at your option) any later version. |
| 9 |
|
| 10 |
This program is distributed in the hope that it will be useful, |
| 11 |
but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 |
GNU General Public License for more details. |
| 14 |
|
| 15 |
You should have received a copy of the GNU General Public License |
| 16 |
along with this program; if not, write to the Free Software |
| 17 |
Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 18 |
*/ |
| 19 |
|
| 20 |
#ifndef VPE_CONNECTION_H__ |
| 21 |
#define VPE_CONNECTION_H__ |
| 22 |
|
| 23 |
#include <openssl/hmac.h> |
| 24 |
|
| 25 |
#include "global.h" |
| 26 |
#include "conf.h" |
| 27 |
#include "sockinfo.h" |
| 28 |
#include "util.h" |
| 29 |
#include "device.h" |
| 30 |
|
| 31 |
struct vpn; |
| 32 |
|
| 33 |
// called after HUP etc. to (re-)initialize global data structures |
| 34 |
void connection_init (); |
| 35 |
|
| 36 |
struct rsaid { |
| 37 |
u8 id[RSA_IDLEN]; // the challenge id |
| 38 |
}; |
| 39 |
|
| 40 |
typedef u8 rsachallenge[RSA_KEYLEN - RSA_OVERHEAD]; // challenge data; |
| 41 |
typedef u8 rsaencrdata[RSA_KEYLEN]; // encrypted challenge |
| 42 |
typedef u8 rsaresponse[RSA_RESLEN]; // the encrypted ripemd160 hash |
| 43 |
|
| 44 |
//////////////////////////////////////////////////////////////////////////////////////// |
| 45 |
|
| 46 |
struct crypto_ctx; |
| 47 |
|
| 48 |
struct hmac_packet:net_packet |
| 49 |
{ |
| 50 |
u8 hmac[HMACLENGTH]; // each and every packet has a hmac field, but that is not (yet) checked everywhere |
| 51 |
|
| 52 |
void hmac_set (crypto_ctx * ctx); |
| 53 |
bool hmac_chk (crypto_ctx * ctx); |
| 54 |
|
| 55 |
private: |
| 56 |
static unsigned char hmac_digest[EVP_MAX_MD_SIZE]; |
| 57 |
|
| 58 |
void hmac_gen (crypto_ctx * ctx); |
| 59 |
}; |
| 60 |
|
| 61 |
struct vpn_packet : hmac_packet |
| 62 |
{ |
| 63 |
enum ptype |
| 64 |
{ |
| 65 |
PT_RESET = 0, |
| 66 |
PT_DATA_UNCOMPRESSED, |
| 67 |
PT_DATA_COMPRESSED, |
| 68 |
PT_PING, PT_PONG, // wasting namespace space? ;) |
| 69 |
PT_AUTH_REQ, // authentification request |
| 70 |
PT_AUTH_RES, // authentification response |
| 71 |
PT_CONNECT_REQ, // want other host to contact me |
| 72 |
PT_CONNECT_INFO, // request connection to some node |
| 73 |
PT_MAX |
| 74 |
}; |
| 75 |
|
| 76 |
u8 type; |
| 77 |
u8 srcdst, src1, dst1; |
| 78 |
|
| 79 |
void set_hdr (ptype type_, unsigned int dst); |
| 80 |
|
| 81 |
unsigned int src () const |
| 82 |
{ |
| 83 |
return src1 | ((srcdst >> 4) << 8); |
| 84 |
} |
| 85 |
|
| 86 |
unsigned int dst () const |
| 87 |
{ |
| 88 |
return dst1 | ((srcdst & 0xf) << 8); |
| 89 |
} |
| 90 |
|
| 91 |
ptype typ () const |
| 92 |
{ |
| 93 |
return (ptype) type; |
| 94 |
} |
| 95 |
}; |
| 96 |
|
| 97 |
//////////////////////////////////////////////////////////////////////////////////////// |
| 98 |
|
| 99 |
// a very simple fifo pkt-queue |
| 100 |
class pkt_queue |
| 101 |
{ |
| 102 |
net_packet *queue[QUEUEDEPTH]; |
| 103 |
int i, j; |
| 104 |
|
| 105 |
public: |
| 106 |
|
| 107 |
void put (net_packet *p); |
| 108 |
net_packet *get (); |
| 109 |
|
| 110 |
pkt_queue (); |
| 111 |
~pkt_queue (); |
| 112 |
}; |
| 113 |
|
| 114 |
struct connection |
| 115 |
{ |
| 116 |
conf_node *conf; |
| 117 |
struct vpn *vpn; |
| 118 |
|
| 119 |
sockinfo si; // the current(!) destination ip to send packets to |
| 120 |
int retry_cnt; |
| 121 |
|
| 122 |
tstamp last_activity; // time of last packet received |
| 123 |
|
| 124 |
u32 oseqno; |
| 125 |
sliding_window iseqno; |
| 126 |
|
| 127 |
u8 protocol; |
| 128 |
|
| 129 |
pkt_queue data_queue, vpn_queue; |
| 130 |
|
| 131 |
crypto_ctx *octx, *ictx; |
| 132 |
|
| 133 |
enum conf_node::connectmode connectmode; |
| 134 |
u8 prot_minor; // minor number of other side |
| 135 |
|
| 136 |
void reset_si (); |
| 137 |
const sockinfo &forward_si (const sockinfo &si) const; |
| 138 |
|
| 139 |
void shutdown (); |
| 140 |
void connection_established (); |
| 141 |
void reset_connection (); |
| 142 |
|
| 143 |
void establish_connection_cb (time_watcher &w); time_watcher establish_connection; |
| 144 |
void rekey_cb (time_watcher &w); time_watcher rekey; // next rekying (actually current reset + reestablishing) |
| 145 |
void keepalive_cb (time_watcher &w); time_watcher keepalive; // next keepalive probe |
| 146 |
|
| 147 |
void send_connect_request (int id); |
| 148 |
void send_auth_request (const sockinfo &si, bool initiate); |
| 149 |
void send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg); |
| 150 |
void send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols); |
| 151 |
void send_reset (const sockinfo &dsi); |
| 152 |
void send_ping (const sockinfo &dsi, u8 pong = 0); |
| 153 |
void send_data_packet (tap_packet *pkt); |
| 154 |
|
| 155 |
void inject_data_packet (tap_packet *pkt, bool broadcast = false); |
| 156 |
void inject_vpn_packet (vpn_packet *pkt, int tos = 0); // for forwarding |
| 157 |
|
| 158 |
void send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos = 0); |
| 159 |
void recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi); |
| 160 |
|
| 161 |
void script_node (); |
| 162 |
const char *script_node_up (); |
| 163 |
const char *script_node_down (); |
| 164 |
|
| 165 |
void dump_status (); |
| 166 |
|
| 167 |
connection(struct vpn *vpn_); |
| 168 |
~connection (); |
| 169 |
}; |
| 170 |
|
| 171 |
#endif |
| 172 |
|
