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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_N_PACKET_TYPES 9 /* number of packet types (incl type 0) */ |
51 | |
52 | uint8_t flags; /* packet flags */ |
53 | #define RXRPC_CLIENT_INITIATED 0x01 /* signifies a packet generated by a client */ |
54 | #define RXRPC_REQUEST_ACK 0x02 /* request an unconditional ACK of this packet */ |
55 | #define RXRPC_LAST_PACKET 0x04 /* the last packet from this side for this call */ |
56 | #define RXRPC_MORE_PACKETS 0x08 /* more packets to come */ |
57 | #define RXRPC_JUMBO_PACKET 0x20 /* [DATA] this is a jumbo packet */ |
58 | #define RXRPC_SLOW_START_OK 0x20 /* [ACK] slow start supported */ |
59 | |
60 | uint8_t userStatus; /* app-layer defined status */ |
61 | uint8_t securityIndex; /* security protocol ID */ |
62 | union { |
63 | __be16 _rsvd; /* reserved */ |
64 | __be16 cksum; /* kerberos security checksum */ |
65 | }; |
66 | __be16 serviceId; /* service ID */ |
67 | |
68 | } __packed; |
69 | |
70 | #define __rxrpc_header_off(X) offsetof(struct rxrpc_header,X) |
71 | |
72 | extern const char *rxrpc_pkts[]; |
73 | |
74 | /*****************************************************************************/ |
75 | /* |
76 | * jumbo packet secondary header |
77 | * - can be mapped to read header by: |
78 | * - new_serial = serial + 1 |
79 | * - new_seq = seq + 1 |
80 | * - new_flags = j_flags |
81 | * - new__rsvd = j__rsvd |
82 | * - duplicating all other fields |
83 | */ |
84 | struct rxrpc_jumbo_header { |
85 | uint8_t flags; /* packet flags (as per rxrpc_header) */ |
86 | uint8_t pad; |
87 | __be16 _rsvd; /* reserved (used by kerberos security as cksum) */ |
88 | }; |
89 | |
90 | #define RXRPC_JUMBO_DATALEN 1412 /* non-terminal jumbo packet data length */ |
91 | |
92 | /*****************************************************************************/ |
93 | /* |
94 | * on-the-wire Rx ACK packet data payload |
95 | * - all multibyte fields should be in network byte order |
96 | */ |
97 | struct rxrpc_ackpacket { |
98 | __be16 bufferSpace; /* number of packet buffers available */ |
99 | __be16 maxSkew; /* diff between serno being ACK'd and highest serial no |
100 | * received */ |
101 | __be32 firstPacket; /* sequence no of first ACK'd packet in attached list */ |
102 | __be32 previousPacket; /* sequence no of previous packet received */ |
103 | __be32 serial; /* serial no of packet that prompted this ACK */ |
104 | |
105 | uint8_t reason; /* reason for ACK */ |
106 | #define RXRPC_ACK_REQUESTED 1 /* ACK was requested on packet */ |
107 | #define RXRPC_ACK_DUPLICATE 2 /* duplicate packet received */ |
108 | #define RXRPC_ACK_OUT_OF_SEQUENCE 3 /* out of sequence packet received */ |
109 | #define RXRPC_ACK_EXCEEDS_WINDOW 4 /* packet received beyond end of ACK window */ |
110 | #define RXRPC_ACK_NOSPACE 5 /* packet discarded due to lack of buffer space */ |
111 | #define RXRPC_ACK_PING 6 /* keep alive ACK */ |
112 | #define RXRPC_ACK_PING_RESPONSE 7 /* response to RXRPC_ACK_PING */ |
113 | #define RXRPC_ACK_DELAY 8 /* nothing happened since received packet */ |
114 | #define RXRPC_ACK_IDLE 9 /* ACK due to fully received ACK window */ |
115 | |
116 | uint8_t nAcks; /* number of ACKs */ |
117 | #define RXRPC_MAXACKS 255 |
118 | |
119 | uint8_t acks[0]; /* list of ACK/NAKs */ |
120 | #define RXRPC_ACK_TYPE_NACK 0 |
121 | #define RXRPC_ACK_TYPE_ACK 1 |
122 | |
123 | } __packed; |
124 | |
125 | /* |
126 | * ACK packets can have a further piece of information tagged on the end |
127 | */ |
128 | struct rxrpc_ackinfo { |
129 | __be32 rxMTU; /* maximum Rx MTU size (bytes) [AFS 3.3] */ |
130 | __be32 maxMTU; /* maximum interface MTU size (bytes) [AFS 3.3] */ |
131 | __be32 rwind; /* Rx window size (packets) [AFS 3.4] */ |
132 | __be32 jumbo_max; /* max packets to stick into a jumbo packet [AFS 3.5] */ |
133 | }; |
134 | |
135 | /*****************************************************************************/ |
136 | /* |
137 | * Kerberos security type-2 challenge packet |
138 | */ |
139 | struct rxkad_challenge { |
140 | __be32 version; /* version of this challenge type */ |
141 | __be32 nonce; /* encrypted random number */ |
142 | __be32 min_level; /* minimum security level */ |
143 | __be32 __padding; /* padding to 8-byte boundary */ |
144 | } __packed; |
145 | |
146 | /*****************************************************************************/ |
147 | /* |
148 | * Kerberos security type-2 response packet |
149 | */ |
150 | struct rxkad_response { |
151 | __be32 version; /* version of this response type */ |
152 | __be32 __pad; |
153 | |
154 | /* encrypted bit of the response */ |
155 | struct { |
156 | __be32 epoch; /* current epoch */ |
157 | __be32 cid; /* parent connection ID */ |
158 | __be32 checksum; /* checksum */ |
159 | __be32 securityIndex; /* security type */ |
160 | __be32 call_id[4]; /* encrypted call IDs */ |
161 | __be32 inc_nonce; /* challenge nonce + 1 */ |
162 | __be32 level; /* desired level */ |
163 | } encrypted; |
164 | |
165 | __be32 kvno; /* Kerberos key version number */ |
166 | __be32 ticket_len; /* Kerberos ticket length */ |
167 | } __packed; |
168 | |
169 | /*****************************************************************************/ |
170 | /* |
171 | * RxRPC-level abort codes |
172 | */ |
173 | #define RX_CALL_DEAD -1 /* call/conn has been inactive and is shut down */ |
174 | #define RX_INVALID_OPERATION -2 /* invalid operation requested / attempted */ |
175 | #define RX_CALL_TIMEOUT -3 /* call timeout exceeded */ |
176 | #define RX_EOF -4 /* unexpected end of data on read op */ |
177 | #define RX_PROTOCOL_ERROR -5 /* low-level protocol error */ |
178 | #define RX_USER_ABORT -6 /* generic user abort */ |
179 | #define RX_ADDRINUSE -7 /* UDP port in use */ |
180 | #define RX_DEBUGI_BADTYPE -8 /* bad debugging packet type */ |
181 | |
182 | /* |
183 | * (un)marshalling abort codes (rxgen) |
184 | */ |
185 | #define RXGEN_CC_MARSHAL -450 |
186 | #define RXGEN_CC_UNMARSHAL -451 |
187 | #define RXGEN_SS_MARSHAL -452 |
188 | #define RXGEN_SS_UNMARSHAL -453 |
189 | #define RXGEN_DECODE -454 |
190 | #define RXGEN_OPCODE -455 |
191 | #define RXGEN_SS_XDRFREE -456 |
192 | #define RXGEN_CC_XDRFREE -457 |
193 | |
194 | /* |
195 | * Rx kerberos security abort codes |
196 | * - unfortunately we have no generalised security abort codes to say things |
197 | * like "unsupported security", so we have to use these instead and hope the |
198 | * other side understands |
199 | */ |
200 | #define RXKADINCONSISTENCY 19270400 /* security module structure inconsistent */ |
201 | #define RXKADPACKETSHORT 19270401 /* packet too short for security challenge */ |
202 | #define RXKADLEVELFAIL 19270402 /* security level negotiation failed */ |
203 | #define RXKADTICKETLEN 19270403 /* ticket length too short or too long */ |
204 | #define RXKADOUTOFSEQUENCE 19270404 /* packet had bad sequence number */ |
205 | #define RXKADNOAUTH 19270405 /* caller not authorised */ |
206 | #define RXKADBADKEY 19270406 /* illegal key: bad parity or weak */ |
207 | #define RXKADBADTICKET 19270407 /* security object was passed a bad ticket */ |
208 | #define RXKADUNKNOWNKEY 19270408 /* ticket contained unknown key version number */ |
209 | #define RXKADEXPIRED 19270409 /* authentication expired */ |
210 | #define RXKADSEALEDINCON 19270410 /* sealed data inconsistent */ |
211 | #define RXKADDATALEN 19270411 /* user data too long */ |
212 | #define RXKADILLEGALLEVEL 19270412 /* caller not authorised to use encrypted conns */ |
213 | |
214 | #endif /* _LINUX_RXRPC_PACKET_H */ |
215 |
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