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Subject[PATCH RFC V1 net-next 1/6] net: Add a new socket option for a future transmit time.
Date
This patch introduces SO_TXTIME.  User space enables this option in
order to pass a desired future transmit time in a CMSG when calling
sendmsg(2).

Signed-off-by: Richard Cochran <rcochran@linutronix.de>
---
arch/alpha/include/uapi/asm/socket.h | 3 +++
arch/frv/include/uapi/asm/socket.h | 3 +++
arch/ia64/include/uapi/asm/socket.h | 3 +++
arch/m32r/include/uapi/asm/socket.h | 3 +++
arch/mips/include/uapi/asm/socket.h | 3 +++
arch/mn10300/include/uapi/asm/socket.h | 3 +++
arch/parisc/include/uapi/asm/socket.h | 3 +++
arch/powerpc/include/uapi/asm/socket.h | 3 +++
arch/s390/include/uapi/asm/socket.h | 3 +++
arch/sparc/include/uapi/asm/socket.h | 3 +++
arch/xtensa/include/uapi/asm/socket.h | 3 +++
include/net/sock.h | 2 ++
include/uapi/asm-generic/socket.h | 3 +++
net/core/sock.c | 12 ++++++++++++
14 files changed, 50 insertions(+)

diff --git a/arch/alpha/include/uapi/asm/socket.h b/arch/alpha/include/uapi/asm/socket.h
index c6133a045352..4dfacba7820e 100644
--- a/arch/alpha/include/uapi/asm/socket.h
+++ b/arch/alpha/include/uapi/asm/socket.h
@@ -111,4 +111,7 @@

#define SO_ZEROCOPY 60

+#define SO_TXTIME 61
+#define SCM_TXTIME SO_TXTIME
+
#endif /* _UAPI_ASM_SOCKET_H */
diff --git a/arch/frv/include/uapi/asm/socket.h b/arch/frv/include/uapi/asm/socket.h
index 9abf02d6855a..ccf79fe9f35a 100644
--- a/arch/frv/include/uapi/asm/socket.h
+++ b/arch/frv/include/uapi/asm/socket.h
@@ -104,5 +104,8 @@

#define SO_ZEROCOPY 60

+#define SO_TXTIME 61
+#define SCM_TXTIME SO_TXTIME
+
#endif /* _ASM_SOCKET_H */

diff --git a/arch/ia64/include/uapi/asm/socket.h b/arch/ia64/include/uapi/asm/socket.h
index 002eb85a6941..2da305fa85ee 100644
--- a/arch/ia64/include/uapi/asm/socket.h
+++ b/arch/ia64/include/uapi/asm/socket.h
@@ -113,4 +113,7 @@

#define SO_ZEROCOPY 60

+#define SO_TXTIME 61
+#define SCM_TXTIME SO_TXTIME
+
#endif /* _ASM_IA64_SOCKET_H */
diff --git a/arch/m32r/include/uapi/asm/socket.h b/arch/m32r/include/uapi/asm/socket.h
index e268e51a38d1..4d4cde60c520 100644
--- a/arch/m32r/include/uapi/asm/socket.h
+++ b/arch/m32r/include/uapi/asm/socket.h
@@ -104,4 +104,7 @@

#define SO_ZEROCOPY 60

+#define SO_TXTIME 61
+#define SCM_TXTIME SO_TXTIME
+
#endif /* _ASM_M32R_SOCKET_H */
diff --git a/arch/mips/include/uapi/asm/socket.h b/arch/mips/include/uapi/asm/socket.h
index 6c755bc07975..b6e13bbf970c 100644
--- a/arch/mips/include/uapi/asm/socket.h
+++ b/arch/mips/include/uapi/asm/socket.h
@@ -122,4 +122,7 @@

#define SO_ZEROCOPY 60

+#define SO_TXTIME 61
+#define SCM_TXTIME SO_TXTIME
+
#endif /* _UAPI_ASM_SOCKET_H */
diff --git a/arch/mn10300/include/uapi/asm/socket.h b/arch/mn10300/include/uapi/asm/socket.h
index ac82a3f26dbf..0234496dc969 100644
--- a/arch/mn10300/include/uapi/asm/socket.h
+++ b/arch/mn10300/include/uapi/asm/socket.h
@@ -104,4 +104,7 @@

#define SO_ZEROCOPY 60

+#define SO_TXTIME 61
+#define SCM_TXTIME SO_TXTIME
+
#endif /* _ASM_SOCKET_H */
diff --git a/arch/parisc/include/uapi/asm/socket.h b/arch/parisc/include/uapi/asm/socket.h
index 3b2bf7ae703b..e2a282fefcd6 100644
--- a/arch/parisc/include/uapi/asm/socket.h
+++ b/arch/parisc/include/uapi/asm/socket.h
@@ -103,4 +103,7 @@

#define SO_ZEROCOPY 0x4035

+#define SO_TXTIME 0x4036
+#define SCM_TXTIME SO_TXTIME
+
#endif /* _UAPI_ASM_SOCKET_H */
diff --git a/arch/powerpc/include/uapi/asm/socket.h b/arch/powerpc/include/uapi/asm/socket.h
index 3c590c7c42c0..55718129ab06 100644
--- a/arch/powerpc/include/uapi/asm/socket.h
+++ b/arch/powerpc/include/uapi/asm/socket.h
@@ -17,4 +17,7 @@

#include <asm-generic/socket.h>

+#define SO_TXTIME 54
+#define SCM_TXTIME SO_TXTIME
+
#endif /* _ASM_POWERPC_SOCKET_H */
diff --git a/arch/s390/include/uapi/asm/socket.h b/arch/s390/include/uapi/asm/socket.h
index a56916c83565..bfcb29ccf33a 100644
--- a/arch/s390/include/uapi/asm/socket.h
+++ b/arch/s390/include/uapi/asm/socket.h
@@ -110,4 +110,7 @@

#define SO_ZEROCOPY 60

+#define SO_TXTIME 61
+#define SCM_TXTIME SO_TXTIME
+
#endif /* _ASM_SOCKET_H */
diff --git a/arch/sparc/include/uapi/asm/socket.h b/arch/sparc/include/uapi/asm/socket.h
index b2f5c50d0947..2217187f80f2 100644
--- a/arch/sparc/include/uapi/asm/socket.h
+++ b/arch/sparc/include/uapi/asm/socket.h
@@ -100,6 +100,9 @@

#define SO_ZEROCOPY 0x003e

+#define SO_TXTIME 0x003f
+#define SCM_TXTIME SO_TXTIME
+
/* Security levels - as per NRL IPv6 - don't actually do anything */
#define SO_SECURITY_AUTHENTICATION 0x5001
#define SO_SECURITY_ENCRYPTION_TRANSPORT 0x5002
diff --git a/arch/xtensa/include/uapi/asm/socket.h b/arch/xtensa/include/uapi/asm/socket.h
index 220059999e74..36bdbd8bd6ca 100644
--- a/arch/xtensa/include/uapi/asm/socket.h
+++ b/arch/xtensa/include/uapi/asm/socket.h
@@ -115,4 +115,7 @@

#define SO_ZEROCOPY 60

+#define SO_TXTIME 61
+#define SCM_TXTIME SO_TXTIME
+
#endif /* _XTENSA_SOCKET_H */
diff --git a/include/net/sock.h b/include/net/sock.h
index 03a362568357..1c378db1060f 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -778,6 +778,7 @@ enum sock_flags {
SOCK_FILTER_LOCKED, /* Filter cannot be changed anymore */
SOCK_SELECT_ERR_QUEUE, /* Wake select on error queue */
SOCK_RCU_FREE, /* wait rcu grace period in sk_destruct() */
+ SOCK_TXTIME,
};

#define SK_FLAGS_TIMESTAMP ((1UL << SOCK_TIMESTAMP) | (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE))
@@ -1558,6 +1559,7 @@ void sock_kzfree_s(struct sock *sk, void *mem, int size);
void sk_send_sigurg(struct sock *sk);

struct sockcm_cookie {
+ u64 transmit_time;
u32 mark;
u16 tsflags;
};
diff --git a/include/uapi/asm-generic/socket.h b/include/uapi/asm-generic/socket.h
index e47c9e436221..d32e3e1bf4b6 100644
--- a/include/uapi/asm-generic/socket.h
+++ b/include/uapi/asm-generic/socket.h
@@ -106,4 +106,7 @@

#define SO_ZEROCOPY 60

+#define SO_TXTIME 61
+#define SCM_TXTIME SO_TXTIME
+
#endif /* __ASM_GENERIC_SOCKET_H */
diff --git a/net/core/sock.c b/net/core/sock.c
index 9b7b6bbb2a23..d916a4c238dd 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -1059,6 +1059,13 @@ int sock_setsockopt(struct socket *sock, int level, int optname,
sock_valbool_flag(sk, SOCK_ZEROCOPY, valbool);
break;

+ case SO_TXTIME:
+ if (ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
+ sock_valbool_flag(sk, SOCK_TXTIME, valbool);
+ else
+ ret = -EPERM;
+ break;
+
default:
ret = -ENOPROTOOPT;
break;
@@ -2115,6 +2122,11 @@ int __sock_cmsg_send(struct sock *sk, struct msghdr *msg, struct cmsghdr *cmsg,
sockc->tsflags &= ~SOF_TIMESTAMPING_TX_RECORD_MASK;
sockc->tsflags |= tsflags;
break;
+ case SO_TXTIME:
+ if (!sock_flag(sk, SOCK_TXTIME))
+ return -EINVAL;
+ sockc->transmit_time = *(u64 *)CMSG_DATA(cmsg);
+ break;
/* SCM_RIGHTS and SCM_CREDENTIALS are semantically in SOL_UNIX. */
case SCM_RIGHTS:
case SCM_CREDENTIALS:
--
2.11.0
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