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sock: Introduce the SO_PEEK_OFF sock option

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This one specifies where to start MSG_PEEK-ing queue data from. When
set to negative value means that MSG_PEEK works as ususally -- peeks
from the head of the queue always.

When some bytes are peeked from queue and the peeking offset is non
negative it is moved forward so that the next peek will return next
portion of data.

When non-peeking recvmsg occurs and the peeking offset is non negative
is is moved backward so that the next peek will still peek the proper
data (i.e. the one that would have been picked if there were no non
peeking recv in between).

The offset is set using per-proto opteration to let the protocol handle
the locking issues and to check whether the peeking offset feature is
supported by the protocol the socket belongs to.

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Pavel Emelyanov 2012-02-21 07:31:34 +00:00 committed by David S. Miller
parent da5ef6e51b
commit ef64a54f6e
20 changed files with 56 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
arch/alpha/include/asm/socket.h
View File

@ -71,6 +71,7 @@
#define SO_WIFI_STATUS 41
#define SCM_WIFI_STATUS SO_WIFI_STATUS
#define SO_PEEK_OFF 42
/* O_NONBLOCK clashes with the bits used for socket types. Therefore we
* have to define SOCK_NONBLOCK to a different value here.

1
arch/arm/include/asm/socket.h
View File

@ -64,5 +64,6 @@
#define SO_WIFI_STATUS 41
#define SCM_WIFI_STATUS SO_WIFI_STATUS
#define SO_PEEK_OFF 42
#endif /* _ASM_SOCKET_H */

1
arch/avr32/include/asm/socket.h
View File

@ -64,5 +64,6 @@
#define SO_WIFI_STATUS 41
#define SCM_WIFI_STATUS SO_WIFI_STATUS
#define SO_PEEK_OFF 42
#endif /* __ASM_AVR32_SOCKET_H */

1
arch/cris/include/asm/socket.h
View File

@ -66,6 +66,7 @@
#define SO_WIFI_STATUS 41
#define SCM_WIFI_STATUS SO_WIFI_STATUS
#define SO_PEEK_OFF 42
#endif /* _ASM_SOCKET_H */

1
arch/frv/include/asm/socket.h
View File

@ -64,6 +64,7 @@
#define SO_WIFI_STATUS 41
#define SCM_WIFI_STATUS SO_WIFI_STATUS
#define SO_PEEK_OFF 42
#endif /* _ASM_SOCKET_H */

1
arch/h8300/include/asm/socket.h
View File

@ -64,5 +64,6 @@
#define SO_WIFI_STATUS 41
#define SCM_WIFI_STATUS SO_WIFI_STATUS
#define SO_PEEK_OFF 42
#endif /* _ASM_SOCKET_H */

1
arch/ia64/include/asm/socket.h
View File

@ -73,5 +73,6 @@
#define SO_WIFI_STATUS 41
#define SCM_WIFI_STATUS SO_WIFI_STATUS
#define SO_PEEK_OFF 42
#endif /* _ASM_IA64_SOCKET_H */

1
arch/m32r/include/asm/socket.h
View File

@ -64,5 +64,6 @@
#define SO_WIFI_STATUS 41
#define SCM_WIFI_STATUS SO_WIFI_STATUS
#define SO_PEEK_OFF 42
#endif /* _ASM_M32R_SOCKET_H */

1
arch/m68k/include/asm/socket.h
View File

@ -64,5 +64,6 @@
#define SO_WIFI_STATUS 41
#define SCM_WIFI_STATUS SO_WIFI_STATUS
#define SO_PEEK_OFF 42
#endif /* _ASM_SOCKET_H */

1
arch/mips/include/asm/socket.h
View File

@ -84,6 +84,7 @@ To add: #define SO_REUSEPORT 0x0200 /* Allow local address and port reuse. */
#define SO_WIFI_STATUS 41
#define SCM_WIFI_STATUS SO_WIFI_STATUS
#define SO_PEEK_OFF 42
#ifdef __KERNEL__

1
arch/mn10300/include/asm/socket.h
View File

@ -64,5 +64,6 @@
#define SO_WIFI_STATUS 41
#define SCM_WIFI_STATUS SO_WIFI_STATUS
#define SO_PEEK_OFF 42
#endif /* _ASM_SOCKET_H */

1
arch/parisc/include/asm/socket.h
View File

@ -63,6 +63,7 @@
#define SO_WIFI_STATUS 0x4022
#define SCM_WIFI_STATUS SO_WIFI_STATUS
#define SO_PEEK_OFF 0x4023
/* O_NONBLOCK clashes with the bits used for socket types. Therefore we
* have to define SOCK_NONBLOCK to a different value here.

1
arch/powerpc/include/asm/socket.h
View File

@ -71,5 +71,6 @@
#define SO_WIFI_STATUS 41
#define SCM_WIFI_STATUS SO_WIFI_STATUS
#define SO_PEEK_OFF 42
#endif /* _ASM_POWERPC_SOCKET_H */

1
arch/s390/include/asm/socket.h
View File

@ -72,5 +72,6 @@
#define SO_WIFI_STATUS 41
#define SCM_WIFI_STATUS SO_WIFI_STATUS
#define SO_PEEK_OFF 42
#endif /* _ASM_SOCKET_H */

1
arch/sparc/include/asm/socket.h
View File

@ -60,6 +60,7 @@
#define SO_WIFI_STATUS 0x0025
#define SCM_WIFI_STATUS SO_WIFI_STATUS
#define SO_PEEK_OFF 0x0026
/* Security levels - as per NRL IPv6 - don't actually do anything */
#define SO_SECURITY_AUTHENTICATION 0x5001

1
arch/xtensa/include/asm/socket.h
View File

@ -75,5 +75,6 @@
#define SO_WIFI_STATUS 41
#define SCM_WIFI_STATUS SO_WIFI_STATUS
#define SO_PEEK_OFF 42
#endif /* _XTENSA_SOCKET_H */

1
include/asm-generic/socket.h
View File

@ -67,4 +67,5 @@
#define SO_WIFI_STATUS 41
#define SCM_WIFI_STATUS SO_WIFI_STATUS
#define SO_PEEK_OFF 42
#endif /* __ASM_GENERIC_SOCKET_H */

1
include/linux/net.h
View File

@ -206,6 +206,7 @@ struct proto_ops {
int offset, size_t size, int flags);
ssize_t (*splice_read)(struct socket *sock, loff_t *ppos,
struct pipe_inode_info *pipe, size_t len, unsigned int flags);
void (*set_peek_off)(struct sock *sk, int val);
};
#define DECLARE_SOCKADDR(type, dst, src) \

25
include/net/sock.h
View File

@ -357,6 +357,7 @@ struct sock {
struct page *sk_sndmsg_page;
struct sk_buff *sk_send_head;
__u32 sk_sndmsg_off;
__s32 sk_peek_off;
int sk_write_pending;
#ifdef CONFIG_SECURITY
void *sk_security;
@ -373,6 +374,30 @@ struct sock {
void (*sk_destruct)(struct sock *sk);
};
static inline int sk_peek_offset(struct sock *sk, int flags)
{
if ((flags & MSG_PEEK) && (sk->sk_peek_off >= 0))
return sk->sk_peek_off;
else
return 0;
}
static inline void sk_peek_offset_bwd(struct sock *sk, int val)
{
if (sk->sk_peek_off >= 0) {
if (sk->sk_peek_off >= val)
sk->sk_peek_off -= val;
else
sk->sk_peek_off = 0;
}
}
static inline void sk_peek_offset_fwd(struct sock *sk, int val)
{
if (sk->sk_peek_off >= 0)
sk->sk_peek_off += val;
}
/*
* Hashed lists helper routines
*/

13
net/core/sock.c
View File

@ -793,6 +793,12 @@ set_rcvbuf:
sock_valbool_flag(sk, SOCK_WIFI_STATUS, valbool);
break;
case SO_PEEK_OFF:
if (sock->ops->set_peek_off)
sock->ops->set_peek_off(sk, val);
else
ret = -EOPNOTSUPP;
break;
default:
ret = -ENOPROTOOPT;
break;
@ -1018,6 +1024,12 @@ int sock_getsockopt(struct socket *sock, int level, int optname,
v.val = !!sock_flag(sk, SOCK_WIFI_STATUS);
break;
case SO_PEEK_OFF:
if (!sock->ops->set_peek_off)
return -EOPNOTSUPP;
v.val = sk->sk_peek_off;
break;
default:
return -ENOPROTOOPT;
}
@ -2092,6 +2104,7 @@ void sock_init_data(struct socket *sock, struct sock *sk)
sk->sk_sndmsg_page = NULL;
sk->sk_sndmsg_off = 0;
sk->sk_peek_off = -1;
sk->sk_peer_pid = NULL;
sk->sk_peer_cred = NULL;