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net: Add a new socket option for a future transmit time.

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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). The argument to this socket option is a 8-bytes long struct
provided by the uapi header net_tstamp.h defined as:

struct sock_txtime {
	clockid_t 	clockid;
	u32		flags;
};

Note that new fields were added to struct sock by filling a 2-bytes
hole found in the struct. For that reason, neither the struct size or
number of cachelines were altered.

Signed-off-by: Richard Cochran <rcochran@linutronix.de>
Signed-off-by: Jesus Sanchez-Palencia <jesus.sanchez-palencia@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Richard Cochran 2018-07-03 15:42:48 -07:00 committed by David S. Miller
parent c47d8c2f38
commit 80b14dee2b
11 changed files with 84 additions and 0 deletions
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3
arch/alpha/include/uapi/asm/socket.h
View File

@ -112,4 +112,7 @@
#define SO_ZEROCOPY 60
#define SO_TXTIME 61
#define SCM_TXTIME SO_TXTIME
#endif /* _UAPI_ASM_SOCKET_H */

3
arch/ia64/include/uapi/asm/socket.h
View File

@ -114,4 +114,7 @@
#define SO_ZEROCOPY 60
#define SO_TXTIME 61
#define SCM_TXTIME SO_TXTIME
#endif /* _ASM_IA64_SOCKET_H */

3
arch/mips/include/uapi/asm/socket.h
View File

@ -123,4 +123,7 @@
#define SO_ZEROCOPY 60
#define SO_TXTIME 61
#define SCM_TXTIME SO_TXTIME
#endif /* _UAPI_ASM_SOCKET_H */

3
arch/parisc/include/uapi/asm/socket.h
View File

@ -104,4 +104,7 @@
#define SO_ZEROCOPY 0x4035
#define SO_TXTIME 0x4036
#define SCM_TXTIME SO_TXTIME
#endif /* _UAPI_ASM_SOCKET_H */

3
arch/s390/include/uapi/asm/socket.h
View File

@ -111,4 +111,7 @@
#define SO_ZEROCOPY 60
#define SO_TXTIME 61
#define SCM_TXTIME SO_TXTIME
#endif /* _ASM_SOCKET_H */

3
arch/sparc/include/uapi/asm/socket.h
View File

@ -101,6 +101,9 @@
#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

3
arch/xtensa/include/uapi/asm/socket.h
View File

@ -116,4 +116,7 @@
#define SO_ZEROCOPY 60
#define SO_TXTIME 61
#define SCM_TXTIME SO_TXTIME
#endif /* _XTENSA_SOCKET_H */

10
include/net/sock.h
View File

@ -319,6 +319,9 @@ struct sock_common {
* @sk_destruct: called at sock freeing time, i.e. when all refcnt == 0
* @sk_reuseport_cb: reuseport group container
* @sk_rcu: used during RCU grace period
* @sk_clockid: clockid used by time-based scheduling (SO_TXTIME)
* @sk_txtime_deadline_mode: set deadline mode for SO_TXTIME
* @sk_txtime_unused: unused txtime flags
*/
struct sock {
/*
@ -475,6 +478,11 @@ struct sock {
u8 sk_shutdown;
u32 sk_tskey;
atomic_t sk_zckey;
u8 sk_clockid;
u8 sk_txtime_deadline_mode : 1,
sk_txtime_unused : 7;
struct socket *sk_socket;
void *sk_user_data;
#ifdef CONFIG_SECURITY
@ -790,6 +798,7 @@ 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))
@ -1585,6 +1594,7 @@ 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;
};

3
include/uapi/asm-generic/socket.h
View File

@ -107,4 +107,7 @@
#define SO_ZEROCOPY 60
#define SO_TXTIME 61
#define SCM_TXTIME SO_TXTIME
#endif /* __ASM_GENERIC_SOCKET_H */

15
include/uapi/linux/net_tstamp.h
View File

@ -141,4 +141,19 @@ struct scm_ts_pktinfo {
__u32 reserved[2];
};
/*
* SO_TXTIME gets a struct sock_txtime with flags being an integer bit
* field comprised of these values.
*/
enum txtime_flags {
SOF_TXTIME_DEADLINE_MODE = (1 << 0),
SOF_TXTIME_FLAGS_MASK = (SOF_TXTIME_DEADLINE_MODE)
};
struct sock_txtime {
clockid_t clockid; /* reference clockid */
u32 flags; /* flags defined by enum txtime_flags */
};
#endif /* _NET_TIMESTAMPING_H */

35
net/core/sock.c
View File

@ -91,6 +91,7 @@
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <asm/unaligned.h>
#include <linux/capability.h>
#include <linux/errno.h>
#include <linux/errqueue.h>
@ -697,6 +698,7 @@ EXPORT_SYMBOL(sk_mc_loop);
int sock_setsockopt(struct socket *sock, int level, int optname,
char __user *optval, unsigned int optlen)
{
struct sock_txtime sk_txtime;
struct sock *sk = sock->sk;
int val;
int valbool;
@ -1070,6 +1072,24 @@ int sock_setsockopt(struct socket *sock, int level, int optname,
}
break;
case SO_TXTIME:
if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) {
ret = -EPERM;
} else if (optlen != sizeof(struct sock_txtime)) {
ret = -EINVAL;
} else if (copy_from_user(&sk_txtime, optval,
sizeof(struct sock_txtime))) {
ret = -EFAULT;
} else if (sk_txtime.flags & ~SOF_TXTIME_FLAGS_MASK) {
ret = -EINVAL;
} else {
sock_valbool_flag(sk, SOCK_TXTIME, true);
sk->sk_clockid = sk_txtime.clockid;
sk->sk_txtime_deadline_mode =
!!(sk_txtime.flags & SOF_TXTIME_DEADLINE_MODE);
}
break;
default:
ret = -ENOPROTOOPT;
break;
@ -1115,6 +1135,7 @@ int sock_getsockopt(struct socket *sock, int level, int optname,
u64 val64;
struct linger ling;
struct timeval tm;
struct sock_txtime txtime;
} v;
int lv = sizeof(int);
@ -1403,6 +1424,13 @@ int sock_getsockopt(struct socket *sock, int level, int optname,
v.val = sock_flag(sk, SOCK_ZEROCOPY);
break;
case SO_TXTIME:
lv = sizeof(v.txtime);
v.txtime.clockid = sk->sk_clockid;
v.txtime.flags |= sk->sk_txtime_deadline_mode ?
SOF_TXTIME_DEADLINE_MODE : 0;
break;
default:
/* We implement the SO_SNDLOWAT etc to not be settable
* (1003.1g 7).
@ -2137,6 +2165,13 @@ 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 SCM_TXTIME:
if (!sock_flag(sk, SOCK_TXTIME))
return -EINVAL;
if (cmsg->cmsg_len != CMSG_LEN(sizeof(u64)))
return -EINVAL;
sockc->transmit_time = get_unaligned((u64 *)CMSG_DATA(cmsg));
break;
/* SCM_RIGHTS and SCM_CREDENTIALS are semantically in SOL_UNIX. */
case SCM_RIGHTS:
case SCM_CREDENTIALS: