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788352191c
Zero-length arrays as fake flexible arrays are deprecated and we are
moving towards adopting C99 flexible-array members instead.
Transform zero-length array into flexible-array member in struct
rxrpc_ackpacket.
Address the following warnings found with GCC-13 and
-fstrict-flex-arrays=3 enabled:
net/rxrpc/call_event.c:149:38: warning: array subscript i is outside array bounds of ‘uint8_t[0]’ {aka ‘unsigned char[]’} [-Warray-bounds=]
This helps with the ongoing efforts to tighten the FORTIFY_SOURCE
routines on memcpy() and help us make progress towards globally
enabling -fstrict-flex-arrays=3 [1].
Link: https://github.com/KSPP/linux/issues/21
Link: https://github.com/KSPP/linux/issues/263
Link: https://gcc.gnu.org/pipermail/gcc-patches/2022-October/602902.html [1]
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Jeffrey Altman <jaltman@auristor.com>
cc: Marc Dionne <marc.dionne@auristor.com>
cc: "David S. Miller" <davem@davemloft.net>
cc: Eric Dumazet <edumazet@google.com>
cc: Jakub Kicinski <kuba@kernel.org>
cc: Paolo Abeni <pabeni@redhat.com>
cc: linux-afs@lists.infradead.org
cc: netdev@vger.kernel.org
cc: linux-hardening@vger.kernel.org
Link: https://lore.kernel.org/r/ZAZT11n4q5bBttW0@work/
Signed-off-by: David S. Miller <davem@davemloft.net>
180 lines
6.8 KiB
C
180 lines
6.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/* packet.h: Rx packet layout and definitions
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*
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* Copyright (C) 2002, 2007 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*/
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#ifndef _LINUX_RXRPC_PACKET_H
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#define _LINUX_RXRPC_PACKET_H
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typedef u32 rxrpc_seq_t; /* Rx message sequence number */
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typedef u32 rxrpc_serial_t; /* Rx message serial number */
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typedef __be32 rxrpc_seq_net_t; /* on-the-wire Rx message sequence number */
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typedef __be32 rxrpc_serial_net_t; /* on-the-wire Rx message serial number */
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/*****************************************************************************/
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/*
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* on-the-wire Rx packet header
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* - all multibyte fields should be in network byte order
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*/
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struct rxrpc_wire_header {
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__be32 epoch; /* client boot timestamp */
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#define RXRPC_RANDOM_EPOCH 0x80000000 /* Random if set, date-based if not */
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__be32 cid; /* connection and channel ID */
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#define RXRPC_MAXCALLS 4 /* max active calls per conn */
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#define RXRPC_CHANNELMASK (RXRPC_MAXCALLS-1) /* mask for channel ID */
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#define RXRPC_CIDMASK (~RXRPC_CHANNELMASK) /* mask for connection ID */
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#define RXRPC_CIDSHIFT ilog2(RXRPC_MAXCALLS) /* shift for connection ID */
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#define RXRPC_CID_INC (1 << RXRPC_CIDSHIFT) /* connection ID increment */
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__be32 callNumber; /* call ID (0 for connection-level packets) */
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__be32 seq; /* sequence number of pkt in call stream */
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__be32 serial; /* serial number of pkt sent to network */
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uint8_t type; /* packet type */
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#define RXRPC_PACKET_TYPE_DATA 1 /* data */
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#define RXRPC_PACKET_TYPE_ACK 2 /* ACK */
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#define RXRPC_PACKET_TYPE_BUSY 3 /* call reject */
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#define RXRPC_PACKET_TYPE_ABORT 4 /* call/connection abort */
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#define RXRPC_PACKET_TYPE_ACKALL 5 /* ACK all outstanding packets on call */
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#define RXRPC_PACKET_TYPE_CHALLENGE 6 /* connection security challenge (SRVR->CLNT) */
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#define RXRPC_PACKET_TYPE_RESPONSE 7 /* connection secutity response (CLNT->SRVR) */
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#define RXRPC_PACKET_TYPE_DEBUG 8 /* debug info request */
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#define RXRPC_PACKET_TYPE_PARAMS 9 /* Parameter negotiation (unspec'd, ignore) */
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#define RXRPC_PACKET_TYPE_10 10 /* Ignored */
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#define RXRPC_PACKET_TYPE_11 11 /* Ignored */
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#define RXRPC_PACKET_TYPE_VERSION 13 /* version string request */
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uint8_t flags; /* packet flags */
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#define RXRPC_CLIENT_INITIATED 0x01 /* signifies a packet generated by a client */
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#define RXRPC_REQUEST_ACK 0x02 /* request an unconditional ACK of this packet */
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#define RXRPC_LAST_PACKET 0x04 /* the last packet from this side for this call */
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#define RXRPC_MORE_PACKETS 0x08 /* more packets to come */
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#define RXRPC_JUMBO_PACKET 0x20 /* [DATA] this is a jumbo packet */
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#define RXRPC_SLOW_START_OK 0x20 /* [ACK] slow start supported */
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uint8_t userStatus; /* app-layer defined status */
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#define RXRPC_USERSTATUS_SERVICE_UPGRADE 0x01 /* AuriStor service upgrade request */
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uint8_t securityIndex; /* security protocol ID */
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union {
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__be16 _rsvd; /* reserved */
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__be16 cksum; /* kerberos security checksum */
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};
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__be16 serviceId; /* service ID */
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} __packed;
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/*****************************************************************************/
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/*
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* jumbo packet secondary header
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* - can be mapped to read header by:
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* - new_serial = serial + 1
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* - new_seq = seq + 1
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* - new_flags = j_flags
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* - new__rsvd = j__rsvd
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* - duplicating all other fields
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*/
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struct rxrpc_jumbo_header {
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uint8_t flags; /* packet flags (as per rxrpc_header) */
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uint8_t pad;
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union {
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__be16 _rsvd; /* reserved */
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__be16 cksum; /* kerberos security checksum */
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};
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} __packed;
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#define RXRPC_JUMBO_DATALEN 1412 /* non-terminal jumbo packet data length */
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#define RXRPC_JUMBO_SUBPKTLEN (RXRPC_JUMBO_DATALEN + sizeof(struct rxrpc_jumbo_header))
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/*
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* The maximum number of subpackets that can possibly fit in a UDP packet is:
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*
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* ((max_IP - IP_hdr - UDP_hdr) / RXRPC_JUMBO_SUBPKTLEN) + 1
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* = ((65535 - 28 - 28) / 1416) + 1
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* = 46 non-terminal packets and 1 terminal packet.
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*/
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#define RXRPC_MAX_NR_JUMBO 47
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/*****************************************************************************/
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/*
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* on-the-wire Rx ACK packet data payload
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* - all multibyte fields should be in network byte order
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*/
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struct rxrpc_ackpacket {
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__be16 bufferSpace; /* number of packet buffers available */
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__be16 maxSkew; /* diff between serno being ACK'd and highest serial no
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* received */
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__be32 firstPacket; /* sequence no of first ACK'd packet in attached list */
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__be32 previousPacket; /* sequence no of previous packet received */
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__be32 serial; /* serial no of packet that prompted this ACK */
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uint8_t reason; /* reason for ACK */
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#define RXRPC_ACK_REQUESTED 1 /* ACK was requested on packet */
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#define RXRPC_ACK_DUPLICATE 2 /* duplicate packet received */
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#define RXRPC_ACK_OUT_OF_SEQUENCE 3 /* out of sequence packet received */
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#define RXRPC_ACK_EXCEEDS_WINDOW 4 /* packet received beyond end of ACK window */
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#define RXRPC_ACK_NOSPACE 5 /* packet discarded due to lack of buffer space */
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#define RXRPC_ACK_PING 6 /* keep alive ACK */
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#define RXRPC_ACK_PING_RESPONSE 7 /* response to RXRPC_ACK_PING */
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#define RXRPC_ACK_DELAY 8 /* nothing happened since received packet */
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#define RXRPC_ACK_IDLE 9 /* ACK due to fully received ACK window */
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#define RXRPC_ACK__INVALID 10 /* Representation of invalid ACK reason */
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uint8_t nAcks; /* number of ACKs */
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#define RXRPC_MAXACKS 255
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uint8_t acks[]; /* list of ACK/NAKs */
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#define RXRPC_ACK_TYPE_NACK 0
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#define RXRPC_ACK_TYPE_ACK 1
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} __packed;
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/*
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* ACK packets can have a further piece of information tagged on the end
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*/
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struct rxrpc_ackinfo {
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__be32 rxMTU; /* maximum Rx MTU size (bytes) [AFS 3.3] */
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__be32 maxMTU; /* maximum interface MTU size (bytes) [AFS 3.3] */
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__be32 rwind; /* Rx window size (packets) [AFS 3.4] */
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__be32 jumbo_max; /* max packets to stick into a jumbo packet [AFS 3.5] */
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};
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/*****************************************************************************/
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/*
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* Kerberos security type-2 challenge packet
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*/
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struct rxkad_challenge {
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__be32 version; /* version of this challenge type */
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__be32 nonce; /* encrypted random number */
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__be32 min_level; /* minimum security level */
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__be32 __padding; /* padding to 8-byte boundary */
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} __packed;
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/*****************************************************************************/
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/*
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* Kerberos security type-2 response packet
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*/
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struct rxkad_response {
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__be32 version; /* version of this response type */
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__be32 __pad;
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/* encrypted bit of the response */
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struct {
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__be32 epoch; /* current epoch */
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__be32 cid; /* parent connection ID */
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__be32 checksum; /* checksum */
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__be32 securityIndex; /* security type */
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__be32 call_id[4]; /* encrypted call IDs */
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__be32 inc_nonce; /* challenge nonce + 1 */
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__be32 level; /* desired level */
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} encrypted;
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__be32 kvno; /* Kerberos key version number */
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__be32 ticket_len; /* Kerberos ticket length */
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} __packed;
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#endif /* _LINUX_RXRPC_PACKET_H */
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