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TOMOYO Linux Cross Reference
Linux/include/rxrpc/packet.h

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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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