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sock: add SOCK_ZEROCOPY sockopt

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The send call ignores unknown flags. Legacy applications may already
unwittingly pass MSG_ZEROCOPY. Continue to ignore this flag unless a
socket opts in to zerocopy.

Introduce socket option SO_ZEROCOPY to enable MSG_ZEROCOPY processing.
Processes can also query this socket option to detect kernel support
for the feature. Older kernels will return ENOPROTOOPT.

Signed-off-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Willem de Bruijn
2017-08-03 16:29:40 -04:00
committed by David S. Miller
parent 52267790ef
commit 76851d1212
13 changed files with 43 additions and 0 deletions
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arch/sparc/include/uapi/asm/socket.h
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@@ -98,6 +98,8 @@
#define SO_PEERGROUPS 0x003d
#define SO_ZEROCOPY 0x003e
/* Security levels - as per NRL IPv6 - don't actually do anything */
#define SO_SECURITY_AUTHENTICATION 0x5001
#define SO_SECURITY_ENCRYPTION_TRANSPORT 0x5002