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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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63ed1aab3d
This change adds a couple of new ioctls for mctp sockets: SIOCMCTPALLOCTAG and SIOCMCTPDROPTAG. These ioctls provide facilities for explicit allocation / release of tags, overriding the automatic allocate-on-send/release-on-reply and timeout behaviours. This allows userspace more control over messages that may not fit a simple request/response model. In order to indicate a pre-allocated tag to the sendmsg() syscall, we introduce a new flag to the struct sockaddr_mctp.smctp_tag value: MCTP_TAG_PREALLOC. Additional changes from Jeremy Kerr <jk@codeconstruct.com.au>. Contains a fix that was: Reported-by: kernel test robot <lkp@intel.com> Signed-off-by: Matt Johnston <matt@codeconstruct.com.au> Signed-off-by: Jeremy Kerr <jk@codeconstruct.com.au> Signed-off-by: David S. Miller <davem@davemloft.net>
68 lines
1.5 KiB
C
68 lines
1.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
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/*
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* Management Component Transport Protocol (MCTP)
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*
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* Copyright (c) 2021 Code Construct
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* Copyright (c) 2021 Google
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*/
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#ifndef __UAPI_MCTP_H
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#define __UAPI_MCTP_H
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#include <linux/types.h>
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#include <linux/socket.h>
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#include <linux/netdevice.h>
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typedef __u8 mctp_eid_t;
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struct mctp_addr {
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mctp_eid_t s_addr;
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};
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struct sockaddr_mctp {
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__kernel_sa_family_t smctp_family;
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__u16 __smctp_pad0;
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unsigned int smctp_network;
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struct mctp_addr smctp_addr;
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__u8 smctp_type;
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__u8 smctp_tag;
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__u8 __smctp_pad1;
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};
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struct sockaddr_mctp_ext {
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struct sockaddr_mctp smctp_base;
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int smctp_ifindex;
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__u8 smctp_halen;
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__u8 __smctp_pad0[3];
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__u8 smctp_haddr[MAX_ADDR_LEN];
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};
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#define MCTP_NET_ANY 0x0
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#define MCTP_ADDR_NULL 0x00
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#define MCTP_ADDR_ANY 0xff
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#define MCTP_TAG_MASK 0x07
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#define MCTP_TAG_OWNER 0x08
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#define MCTP_TAG_PREALLOC 0x10
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#define MCTP_OPT_ADDR_EXT 1
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#define SIOCMCTPALLOCTAG (SIOCPROTOPRIVATE + 0)
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#define SIOCMCTPDROPTAG (SIOCPROTOPRIVATE + 1)
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struct mctp_ioc_tag_ctl {
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mctp_eid_t peer_addr;
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/* For SIOCMCTPALLOCTAG: must be passed as zero, kernel will
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* populate with the allocated tag value. Returned tag value will
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* always have TO and PREALLOC set.
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*
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* For SIOCMCTPDROPTAG: userspace provides tag value to drop, from
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* a prior SIOCMCTPALLOCTAG call (and so must have TO and PREALLOC set).
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*/
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__u8 tag;
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__u16 flags;
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};
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#endif /* __UAPI_MCTP_H */
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