net/rxrpc/protocol.h

1 /* SPDX-License-Identifier: GPL-2.0-or-later */
11 typedef u32	rxrpc_seq_t;	/* Rx message sequence number */
12 typedef u32	rxrpc_serial_t;	/* Rx message serial number */
13 typedef __be32	rxrpc_seq_net_t; /* on-the-wire Rx message sequence number */
14 typedef __be32	rxrpc_serial_net_t; /* on-the-wire Rx message serial number */
18  * on-the-wire Rx packet header
19  * - all multibyte fields should be in network byte order
23 #define RXRPC_RANDOM_EPOCH	0x80000000	/* Random if set, date-based if not */
27 #define RXRPC_CHANNELMASK	(RXRPC_MAXCALLS-1)	/* mask for channel ID */
32 	__be32		callNumber;	/* call ID (0 for connection-level packets) */
33 	__be32		seq;		/* sequence number of pkt in call stream */
34 	__be32		serial;		/* serial number of pkt sent to network */  member
42 #define RXRPC_PACKET_TYPE_CHALLENGE	6	/* connection security challenge (SRVR->CLNT) */
43 #define RXRPC_PACKET_TYPE_RESPONSE	7	/* connection secutity response (CLNT->SRVR) */
58 	uint8_t		userStatus;	/* app-layer defined status */
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
89 #define RXRPC_JUMBO_DATALEN	1412	/* non-terminal jumbo packet data length */
93  * The maximum number of subpackets that can possibly fit in a UDP packet is:
95  *	((max_IP - IP_hdr - UDP_hdr) / RXRPC_JUMBO_SUBPKTLEN) + 1
96  *	= ((65535 - 28 - 28) / 1416) + 1
97  *	= 46 non-terminal packets and 1 terminal packet.
103  * on-the-wire Rx ACK packet data payload
104  * - all multibyte fields should be in network byte order
107 	__be16		bufferSpace;	/* number of packet buffers available */
108 	__be16		maxSkew;	/* diff between serno being ACK'd and highest serial no
112 	__be32		serial;		/* serial no of packet that prompted this ACK */  member
126 	uint8_t		nAcks;		/* number of ACKs */
147  * Kerberos security type-2 challenge packet
151 	__be32		nonce;		/* encrypted random number */
153 	__be32		__padding;	/* padding to 8-byte boundary */
158  * Kerberos security type-2 response packet
175 	__be32		kvno;		/* Kerberos key version number */