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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>
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
Download patch file Download diff file Expand all files Collapse all files

11
include/uapi/linux/mctp.h
View file

@ -11,6 +11,7 @@
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/netdevice.h>
typedef __u8 mctp_eid_t;
@ -28,6 +29,14 @@ struct sockaddr_mctp {
__u8 __smctp_pad1;
};
struct sockaddr_mctp_ext {
struct sockaddr_mctp smctp_base;
int smctp_ifindex;
__u8 smctp_halen;
__u8 __smctp_pad0[3];
__u8 smctp_haddr[MAX_ADDR_LEN];
};
#define MCTP_NET_ANY 0x0
#define MCTP_ADDR_NULL 0x00
@ -36,4 +45,6 @@ struct sockaddr_mctp {
#define MCTP_TAG_MASK 0x07
#define MCTP_TAG_OWNER 0x08
#define MCTP_OPT_ADDR_EXT 1
#endif /* __UAPI_MCTP_H */