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1 /* packet.h: Rx packet layout and definitions
2 *
3 * Copyright (C) 2002, 2007 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 */
11
12 #ifndef _LINUX_RXRPC_PACKET_H
13 #define _LINUX_RXRPC_PACKET_H
14
15 typedef u32 rxrpc_seq_t; /* Rx message sequence number */
16 typedef u32 rxrpc_serial_t; /* Rx message serial number */
17 typedef __be32 rxrpc_seq_net_t; /* on-the-wire Rx message sequence number */
18 typedef __be32 rxrpc_serial_net_t; /* on-the-wire Rx message serial number */
19
20 /*****************************************************************************/
21 /*
22 * on-the-wire Rx packet header
23 * - all multibyte fields should be in network byte order
24 */
25 struct rxrpc_header {
26 __be32 epoch; /* client boot timestamp */
27
28 __be32 cid; /* connection and channel ID */
29 #define RXRPC_MAXCALLS 4 /* max active calls per conn */
30 #define RXRPC_CHANNELMASK (RXRPC_MAXCALLS-1) /* mask for channel ID */
31 #define RXRPC_CIDMASK (~RXRPC_CHANNELMASK) /* mask for connection ID */
32 #define RXRPC_CIDSHIFT ilog2(RXRPC_MAXCALLS) /* shift for connection ID */
33 #define RXRPC_CID_INC (1 << RXRPC_CIDSHIFT) /* connection ID increment */
34
35 __be32 callNumber; /* call ID (0 for connection-level packets) */
36 #define RXRPC_PROCESS_MAXCALLS (1<<2) /* maximum number of active calls per conn (power of 2) */
37
38 __be32 seq; /* sequence number of pkt in call stream */
39 __be32 serial; /* serial number of pkt sent to network */
40
41 uint8_t type; /* packet type */
42 #define RXRPC_PACKET_TYPE_DATA 1 /* data */
43 #define RXRPC_PACKET_TYPE_ACK 2 /* ACK */
44 #define RXRPC_PACKET_TYPE_BUSY 3 /* call reject */
45 #define RXRPC_PACKET_TYPE_ABORT 4 /* call/connection abort */
46 #define RXRPC_PACKET_TYPE_ACKALL 5 /* ACK all outstanding packets on call */
47 #define RXRPC_PACKET_TYPE_CHALLENGE 6 /* connection security challenge (SRVR->CLNT) */
48 #define RXRPC_PACKET_TYPE_RESPONSE 7 /* connection secutity response (CLNT->SRVR) */
49 #define RXRPC_PACKET_TYPE_DEBUG 8 /* debug info request */
50 #define RXRPC_PACKET_TYPE_VERSION 13 /* version string request */
51 #define RXRPC_N_PACKET_TYPES 14 /* number of packet types (incl type 0) */
52
53 uint8_t flags; /* packet flags */
54 #define RXRPC_CLIENT_INITIATED 0x01 /* signifies a packet generated by a client */
55 #define RXRPC_REQUEST_ACK 0x02 /* request an unconditional ACK of this packet */
56 #define RXRPC_LAST_PACKET 0x04 /* the last packet from this side for this call */
57 #define RXRPC_MORE_PACKETS 0x08 /* more packets to come */
58 #define RXRPC_JUMBO_PACKET 0x20 /* [DATA] this is a jumbo packet */
59 #define RXRPC_SLOW_START_OK 0x20 /* [ACK] slow start supported */
60
61 uint8_t userStatus; /* app-layer defined status */
62 uint8_t securityIndex; /* security protocol ID */
63 union {
64 __be16 _rsvd; /* reserved */
65 __be16 cksum; /* kerberos security checksum */
66 };
67 __be16 serviceId; /* service ID */
68
69 } __packed;
70
71 #define __rxrpc_header_off(X) offsetof(struct rxrpc_header,X)
72
73 extern const char *rxrpc_pkts[];
74
75 /*****************************************************************************/
76 /*
77 * jumbo packet secondary header
78 * - can be mapped to read header by:
79 * - new_serial = serial + 1
80 * - new_seq = seq + 1
81 * - new_flags = j_flags
82 * - new__rsvd = j__rsvd
83 * - duplicating all other fields
84 */
85 struct rxrpc_jumbo_header {
86 uint8_t flags; /* packet flags (as per rxrpc_header) */
87 uint8_t pad;
88 __be16 _rsvd; /* reserved (used by kerberos security as cksum) */
89 };
90
91 #define RXRPC_JUMBO_DATALEN 1412 /* non-terminal jumbo packet data length */
92
93 /*****************************************************************************/
94 /*
95 * on-the-wire Rx ACK packet data payload
96 * - all multibyte fields should be in network byte order
97 */
98 struct rxrpc_ackpacket {
99 __be16 bufferSpace; /* number of packet buffers available */
100 __be16 maxSkew; /* diff between serno being ACK'd and highest serial no
101 * received */
102 __be32 firstPacket; /* sequence no of first ACK'd packet in attached list */
103 __be32 previousPacket; /* sequence no of previous packet received */
104 __be32 serial; /* serial no of packet that prompted this ACK */
105
106 uint8_t reason; /* reason for ACK */
107 #define RXRPC_ACK_REQUESTED 1 /* ACK was requested on packet */
108 #define RXRPC_ACK_DUPLICATE 2 /* duplicate packet received */
109 #define RXRPC_ACK_OUT_OF_SEQUENCE 3 /* out of sequence packet received */
110 #define RXRPC_ACK_EXCEEDS_WINDOW 4 /* packet received beyond end of ACK window */
111 #define RXRPC_ACK_NOSPACE 5 /* packet discarded due to lack of buffer space */
112 #define RXRPC_ACK_PING 6 /* keep alive ACK */
113 #define RXRPC_ACK_PING_RESPONSE 7 /* response to RXRPC_ACK_PING */
114 #define RXRPC_ACK_DELAY 8 /* nothing happened since received packet */
115 #define RXRPC_ACK_IDLE 9 /* ACK due to fully received ACK window */
116
117 uint8_t nAcks; /* number of ACKs */
118 #define RXRPC_MAXACKS 255
119
120 uint8_t acks[0]; /* list of ACK/NAKs */
121 #define RXRPC_ACK_TYPE_NACK 0
122 #define RXRPC_ACK_TYPE_ACK 1
123
124 } __packed;
125
126 /*
127 * ACK packets can have a further piece of information tagged on the end
128 */
129 struct rxrpc_ackinfo {
130 __be32 rxMTU; /* maximum Rx MTU size (bytes) [AFS 3.3] */
131 __be32 maxMTU; /* maximum interface MTU size (bytes) [AFS 3.3] */
132 __be32 rwind; /* Rx window size (packets) [AFS 3.4] */
133 __be32 jumbo_max; /* max packets to stick into a jumbo packet [AFS 3.5] */
134 };
135
136 /*****************************************************************************/
137 /*
138 * Kerberos security type-2 challenge packet
139 */
140 struct rxkad_challenge {
141 __be32 version; /* version of this challenge type */
142 __be32 nonce; /* encrypted random number */
143 __be32 min_level; /* minimum security level */
144 __be32 __padding; /* padding to 8-byte boundary */
145 } __packed;
146
147 /*****************************************************************************/
148 /*
149 * Kerberos security type-2 response packet
150 */
151 struct rxkad_response {
152 __be32 version; /* version of this response type */
153 __be32 __pad;
154
155 /* encrypted bit of the response */
156 struct {
157 __be32 epoch; /* current epoch */
158 __be32 cid; /* parent connection ID */
159 __be32 checksum; /* checksum */
160 __be32 securityIndex; /* security type */
161 __be32 call_id[4]; /* encrypted call IDs */
162 __be32 inc_nonce; /* challenge nonce + 1 */
163 __be32 level; /* desired level */
164 } encrypted;
165
166 __be32 kvno; /* Kerberos key version number */
167 __be32 ticket_len; /* Kerberos ticket length */
168 } __packed;
169
170 /*****************************************************************************/
171 /*
172 * RxRPC-level abort codes
173 */
174 #define RX_CALL_DEAD -1 /* call/conn has been inactive and is shut down */
175 #define RX_INVALID_OPERATION -2 /* invalid operation requested / attempted */
176 #define RX_CALL_TIMEOUT -3 /* call timeout exceeded */
177 #define RX_EOF -4 /* unexpected end of data on read op */
178 #define RX_PROTOCOL_ERROR -5 /* low-level protocol error */
179 #define RX_USER_ABORT -6 /* generic user abort */
180 #define RX_ADDRINUSE -7 /* UDP port in use */
181 #define RX_DEBUGI_BADTYPE -8 /* bad debugging packet type */
182
183 /*
184 * (un)marshalling abort codes (rxgen)
185 */
186 #define RXGEN_CC_MARSHAL -450
187 #define RXGEN_CC_UNMARSHAL -451
188 #define RXGEN_SS_MARSHAL -452
189 #define RXGEN_SS_UNMARSHAL -453
190 #define RXGEN_DECODE -454
191 #define RXGEN_OPCODE -455
192 #define RXGEN_SS_XDRFREE -456
193 #define RXGEN_CC_XDRFREE -457
194
195 /*
196 * Rx kerberos security abort codes
197 * - unfortunately we have no generalised security abort codes to say things
198 * like "unsupported security", so we have to use these instead and hope the
199 * other side understands
200 */
201 #define RXKADINCONSISTENCY 19270400 /* security module structure inconsistent */
202 #define RXKADPACKETSHORT 19270401 /* packet too short for security challenge */
203 #define RXKADLEVELFAIL 19270402 /* security level negotiation failed */
204 #define RXKADTICKETLEN 19270403 /* ticket length too short or too long */
205 #define RXKADOUTOFSEQUENCE 19270404 /* packet had bad sequence number */
206 #define RXKADNOAUTH 19270405 /* caller not authorised */
207 #define RXKADBADKEY 19270406 /* illegal key: bad parity or weak */
208 #define RXKADBADTICKET 19270407 /* security object was passed a bad ticket */
209 #define RXKADUNKNOWNKEY 19270408 /* ticket contained unknown key version number */
210 #define RXKADEXPIRED 19270409 /* authentication expired */
211 #define RXKADSEALEDINCON 19270410 /* sealed data inconsistent */
212 #define RXKADDATALEN 19270411 /* user data too long */
213 #define RXKADILLEGALLEVEL 19270412 /* caller not authorised to use encrypted conns */
214
215 #endif /* _LINUX_RXRPC_PACKET_H */