1 /* SPDX-License-Identifier: GPL-2.0-or-later * 1
2 /* packet.h: Rx packet layout and definitions
3 *
4 * Copyright (C) 2002, 2007 Red Hat, Inc. All
5 * Written by David Howells (dhowells@redhat.c
6 */
7
8 #ifndef _LINUX_RXRPC_PACKET_H
9 #define _LINUX_RXRPC_PACKET_H
10
11 typedef u32 rxrpc_seq_t; /* Rx message
12 typedef u32 rxrpc_serial_t; /* Rx message
13 typedef __be32 rxrpc_seq_net_t; /* on-the-wir
14 typedef __be32 rxrpc_serial_net_t; /* on-the-
15
16 /*********************************************
17 /*
18 * on-the-wire Rx packet header
19 * - all multibyte fields should be in network
20 */
21 struct rxrpc_wire_header {
22 __be32 epoch; /* cli
23 #define RXRPC_RANDOM_EPOCH 0x80000000
24
25 __be32 cid; /* con
26 #define RXRPC_MAXCALLS 4
27 #define RXRPC_CHANNELMASK (RXRPC_MAXCALL
28 #define RXRPC_CIDMASK (~RXRPC_CHANNE
29 #define RXRPC_CIDSHIFT ilog2(RXRPC_MA
30 #define RXRPC_CID_INC (1 << RXRPC_CI
31
32 __be32 callNumber; /* cal
33 __be32 seq; /* seq
34 __be32 serial; /* ser
35
36 uint8_t type; /* pac
37 #define RXRPC_PACKET_TYPE_DATA 1
38 #define RXRPC_PACKET_TYPE_ACK 2
39 #define RXRPC_PACKET_TYPE_BUSY 3
40 #define RXRPC_PACKET_TYPE_ABORT 4
41 #define RXRPC_PACKET_TYPE_ACKALL 5
42 #define RXRPC_PACKET_TYPE_CHALLENGE 6
43 #define RXRPC_PACKET_TYPE_RESPONSE 7
44 #define RXRPC_PACKET_TYPE_DEBUG 8
45 #define RXRPC_PACKET_TYPE_PARAMS 9
46 #define RXRPC_PACKET_TYPE_10 10
47 #define RXRPC_PACKET_TYPE_11 11
48 #define RXRPC_PACKET_TYPE_VERSION 13
49
50 uint8_t flags; /* pac
51 #define RXRPC_CLIENT_INITIATED 0x01
52 #define RXRPC_REQUEST_ACK 0x02
53 #define RXRPC_LAST_PACKET 0x04
54 #define RXRPC_MORE_PACKETS 0x08
55 #define RXRPC_JUMBO_PACKET 0x20
56 #define RXRPC_SLOW_START_OK 0x20
57
58 uint8_t userStatus; /* app
59 #define RXRPC_USERSTATUS_SERVICE_UPGRADE 0x01
60
61 uint8_t securityIndex; /* sec
62 union {
63 __be16 _rsvd; /* res
64 __be16 cksum; /* ker
65 };
66 __be16 serviceId; /* ser
67
68 } __packed;
69
70 /*********************************************
71 /*
72 * jumbo packet secondary header
73 * - can be mapped to read header by:
74 * - new_serial = serial + 1
75 * - new_seq = seq + 1
76 * - new_flags = j_flags
77 * - new__rsvd = j__rsvd
78 * - duplicating all other fields
79 */
80 struct rxrpc_jumbo_header {
81 uint8_t flags; /* pac
82 uint8_t pad;
83 union {
84 __be16 _rsvd; /* res
85 __be16 cksum; /* ker
86 };
87 } __packed;
88
89 #define RXRPC_JUMBO_DATALEN 1412 /* non
90 #define RXRPC_JUMBO_SUBPKTLEN (RXRPC_JUMBO_D
91
92 /*
93 * The maximum number of subpackets that can p
94 *
95 * ((max_IP - IP_hdr - UDP_hdr) / RXRPC_J
96 * = ((65535 - 28 - 28) / 1416) + 1
97 * = 46 non-terminal packets and 1 termin
98 */
99 #define RXRPC_MAX_NR_JUMBO 47
100
101 /*********************************************
102 /*
103 * on-the-wire Rx ACK packet data payload
104 * - all multibyte fields should be in network
105 */
106 struct rxrpc_ackpacket {
107 __be16 bufferSpace; /* num
108 __be16 maxSkew; /* dif
109 * rec
110 __be32 firstPacket; /* seq
111 __be32 previousPacket; /* seq
112 __be32 serial; /* ser
113
114 uint8_t reason; /* rea
115 #define RXRPC_ACK_REQUESTED 1
116 #define RXRPC_ACK_DUPLICATE 2
117 #define RXRPC_ACK_OUT_OF_SEQUENCE 3
118 #define RXRPC_ACK_EXCEEDS_WINDOW 4
119 #define RXRPC_ACK_NOSPACE 5
120 #define RXRPC_ACK_PING 6
121 #define RXRPC_ACK_PING_RESPONSE 7
122 #define RXRPC_ACK_DELAY 8
123 #define RXRPC_ACK_IDLE 9
124 #define RXRPC_ACK__INVALID 10
125
126 uint8_t nAcks; /* num
127 #define RXRPC_MAXACKS 255
128
129 uint8_t acks[]; /* lis
130 #define RXRPC_ACK_TYPE_NACK 0
131 #define RXRPC_ACK_TYPE_ACK 1
132
133 } __packed;
134
135 /*
136 * ACK packets can have a further piece of inf
137 */
138 struct rxrpc_acktrailer {
139 __be32 maxMTU; /* max
140 __be32 ifMTU; /* max
141 __be32 rwind; /* Rx
142 __be32 jumbo_max; /* max
143 };
144
145 /*********************************************
146 /*
147 * Kerberos security type-2 challenge packet
148 */
149 struct rxkad_challenge {
150 __be32 version; /* ver
151 __be32 nonce; /* enc
152 __be32 min_level; /* min
153 __be32 __padding; /* pad
154 } __packed;
155
156 /*********************************************
157 /*
158 * Kerberos security type-2 response packet
159 */
160 struct rxkad_response {
161 __be32 version; /* ver
162 __be32 __pad;
163
164 /* encrypted bit of the response */
165 struct {
166 __be32 epoch;
167 __be32 cid;
168 __be32 checksum;
169 __be32 securityIndex;
170 __be32 call_id[4];
171 __be32 inc_nonce;
172 __be32 level;
173 } encrypted;
174
175 __be32 kvno; /* Ker
176 __be32 ticket_len; /* Ker
177 } __packed;
178
179 #endif /* _LINUX_RXRPC_PACKET_H */
180
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