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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 | /* SPDX-License-Identifier: GPL-2.0-or-later */ /* packet.h: Rx packet layout and definitions * * Copyright (C) 2002, 2007 Red Hat, Inc. All Rights Reserved. * Written by David Howells (dhowells@redhat.com) */ #ifndef _LINUX_RXRPC_PACKET_H #define _LINUX_RXRPC_PACKET_H typedef u32 rxrpc_seq_t; /* Rx message sequence number */ typedef u32 rxrpc_serial_t; /* Rx message serial number */ typedef __be32 rxrpc_seq_net_t; /* on-the-wire Rx message sequence number */ typedef __be32 rxrpc_serial_net_t; /* on-the-wire Rx message serial number */ /*****************************************************************************/ /* * on-the-wire Rx packet header * - all multibyte fields should be in network byte order */ struct rxrpc_wire_header { __be32 epoch; /* client boot timestamp */ #define RXRPC_RANDOM_EPOCH 0x80000000 /* Random if set, date-based if not */ __be32 cid; /* connection and channel ID */ #define RXRPC_MAXCALLS 4 /* max active calls per conn */ #define RXRPC_CHANNELMASK (RXRPC_MAXCALLS-1) /* mask for channel ID */ #define RXRPC_CIDMASK (~RXRPC_CHANNELMASK) /* mask for connection ID */ #define RXRPC_CIDSHIFT ilog2(RXRPC_MAXCALLS) /* shift for connection ID */ #define RXRPC_CID_INC (1 << RXRPC_CIDSHIFT) /* connection ID increment */ __be32 callNumber; /* call ID (0 for connection-level packets) */ __be32 seq; /* sequence number of pkt in call stream */ __be32 serial; /* serial number of pkt sent to network */ uint8_t type; /* packet type */ #define RXRPC_PACKET_TYPE_DATA 1 /* data */ #define RXRPC_PACKET_TYPE_ACK 2 /* ACK */ #define RXRPC_PACKET_TYPE_BUSY 3 /* call reject */ #define RXRPC_PACKET_TYPE_ABORT 4 /* call/connection abort */ #define RXRPC_PACKET_TYPE_ACKALL 5 /* ACK all outstanding packets on call */ #define RXRPC_PACKET_TYPE_CHALLENGE 6 /* connection security challenge (SRVR->CLNT) */ #define RXRPC_PACKET_TYPE_RESPONSE 7 /* connection secutity response (CLNT->SRVR) */ #define RXRPC_PACKET_TYPE_DEBUG 8 /* debug info request */ #define RXRPC_PACKET_TYPE_PARAMS 9 /* Parameter negotiation (unspec'd, ignore) */ #define RXRPC_PACKET_TYPE_10 10 /* Ignored */ #define RXRPC_PACKET_TYPE_11 11 /* Ignored */ #define RXRPC_PACKET_TYPE_VERSION 13 /* version string request */ uint8_t flags; /* packet flags */ #define RXRPC_CLIENT_INITIATED 0x01 /* signifies a packet generated by a client */ #define RXRPC_REQUEST_ACK 0x02 /* request an unconditional ACK of this packet */ #define RXRPC_LAST_PACKET 0x04 /* the last packet from this side for this call */ #define RXRPC_MORE_PACKETS 0x08 /* more packets to come */ #define RXRPC_JUMBO_PACKET 0x20 /* [DATA] this is a jumbo packet */ #define RXRPC_SLOW_START_OK 0x20 /* [ACK] slow start supported */ uint8_t userStatus; /* app-layer defined status */ #define RXRPC_USERSTATUS_SERVICE_UPGRADE 0x01 /* AuriStor service upgrade request */ uint8_t securityIndex; /* security protocol ID */ union { __be16 _rsvd; /* reserved */ __be16 cksum; /* kerberos security checksum */ }; __be16 serviceId; /* service ID */ } __packed; /*****************************************************************************/ /* * jumbo packet secondary header * - can be mapped to read header by: * - new_serial = serial + 1 * - new_seq = seq + 1 * - new_flags = j_flags * - new__rsvd = j__rsvd * - duplicating all other fields */ struct rxrpc_jumbo_header { uint8_t flags; /* packet flags (as per rxrpc_header) */ uint8_t pad; union { __be16 _rsvd; /* reserved */ __be16 cksum; /* kerberos security checksum */ }; } __packed; #define RXRPC_JUMBO_DATALEN 1412 /* non-terminal jumbo packet data length */ #define RXRPC_JUMBO_SUBPKTLEN (RXRPC_JUMBO_DATALEN + sizeof(struct rxrpc_jumbo_header)) /* * The maximum number of subpackets that can possibly fit in a UDP packet is: * * ((max_IP - IP_hdr - UDP_hdr) / RXRPC_JUMBO_SUBPKTLEN) + 1 * = ((65535 - 28 - 28) / 1416) + 1 * = 46 non-terminal packets and 1 terminal packet. */ #define RXRPC_MAX_NR_JUMBO 47 /*****************************************************************************/ /* * on-the-wire Rx ACK packet data payload * - all multibyte fields should be in network byte order */ struct rxrpc_ackpacket { __be16 bufferSpace; /* number of packet buffers available */ __be16 maxSkew; /* diff between serno being ACK'd and highest serial no * received */ __be32 firstPacket; /* sequence no of first ACK'd packet in attached list */ __be32 previousPacket; /* sequence no of previous packet received */ __be32 serial; /* serial no of packet that prompted this ACK */ uint8_t reason; /* reason for ACK */ #define RXRPC_ACK_REQUESTED 1 /* ACK was requested on packet */ #define RXRPC_ACK_DUPLICATE 2 /* duplicate packet received */ #define RXRPC_ACK_OUT_OF_SEQUENCE 3 /* out of sequence packet received */ #define RXRPC_ACK_EXCEEDS_WINDOW 4 /* packet received beyond end of ACK window */ #define RXRPC_ACK_NOSPACE 5 /* packet discarded due to lack of buffer space */ #define RXRPC_ACK_PING 6 /* keep alive ACK */ #define RXRPC_ACK_PING_RESPONSE 7 /* response to RXRPC_ACK_PING */ #define RXRPC_ACK_DELAY 8 /* nothing happened since received packet */ #define RXRPC_ACK_IDLE 9 /* ACK due to fully received ACK window */ #define RXRPC_ACK__INVALID 10 /* Representation of invalid ACK reason */ uint8_t nAcks; /* number of ACKs */ #define RXRPC_MAXACKS 255 uint8_t acks[]; /* list of ACK/NAKs */ #define RXRPC_ACK_TYPE_NACK 0 #define RXRPC_ACK_TYPE_ACK 1 } __packed; /* * ACK packets can have a further piece of information tagged on the end */ struct rxrpc_acktrailer { __be32 maxMTU; /* maximum Rx MTU size (bytes) [AFS 3.3] */ __be32 ifMTU; /* maximum interface MTU size (bytes) [AFS 3.3] */ __be32 rwind; /* Rx window size (packets) [AFS 3.4] */ __be32 jumbo_max; /* max packets to stick into a jumbo packet [AFS 3.5] */ }; /*****************************************************************************/ /* * Kerberos security type-2 challenge packet */ struct rxkad_challenge { __be32 version; /* version of this challenge type */ __be32 nonce; /* encrypted random number */ __be32 min_level; /* minimum security level */ __be32 __padding; /* padding to 8-byte boundary */ } __packed; /*****************************************************************************/ /* * Kerberos security type-2 response packet */ struct rxkad_response { __be32 version; /* version of this response type */ __be32 __pad; /* encrypted bit of the response */ struct { __be32 epoch; /* current epoch */ __be32 cid; /* parent connection ID */ __be32 checksum; /* checksum */ __be32 securityIndex; /* security type */ __be32 call_id[4]; /* encrypted call IDs */ __be32 inc_nonce; /* challenge nonce + 1 */ __be32 level; /* desired level */ } encrypted; __be32 kvno; /* Kerberos key version number */ __be32 ticket_len; /* Kerberos ticket length */ } __packed; #endif /* _LINUX_RXRPC_PACKET_H */ |