mctp: Implement extended addressing

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This change allows an extended address struct - struct sockaddr_mctp_ext
- to be passed to sendmsg/recvmsg. This allows userspace to specify
output ifindex and physical address information (for sendmsg) or receive
the input ifindex/physaddr for incoming messages (for recvmsg). This is
typically used by userspace for MCTP address discovery and assignment
operations.

The extended addressing facility is conditional on a new sockopt:
MCTP_OPT_ADDR_EXT; userspace must explicitly enable addressing before
the kernel will consume/populate the extended address data.

Includes a fix for an uninitialised var:
Reported-by: kernel test robot <lkp@intel.com>

Signed-off-by: Jeremy Kerr <jk@codeconstruct.com.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

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This commit is contained in:

Jeremy Kerr 2021-10-26 09:57:28 +08:00 • committed by David S. Miller

parent 971f5c4079

commit 99ce45d5e7

5 changed files with 170 additions and 39 deletions

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1

include/linux/socket.h

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13

include/net/mctp.h

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11

include/uapi/linux/mctp.h

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86

net/mctp/af_mctp.c

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98

net/mctp/route.c

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