mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-25 13:43:55 +08:00
a8fc927780
The SO_ATTACH_FILTER option is set only. I propose to add the get ability by using SO_ATTACH_FILTER in getsockopt. To be less irritating to eyes the SO_GET_FILTER alias to it is declared. This ability is required by checkpoint-restore project to be able to save full state of a socket. There are two issues with getting filter back. First, kernel modifies the sock_filter->code on filter load, thus in order to return the filter element back to user we have to decode it into user-visible constants. Fortunately the modification in question is interconvertible. Second, the BPF_S_ALU_DIV_K code modifies the command argument k to speed up the run-time division by doing kernel_k = reciprocal(user_k). Bad news is that different user_k may result in same kernel_k, so we can't get the original user_k back. Good news is that we don't have to do it. What we need to is calculate a user2_k so, that reciprocal(user2_k) == reciprocal(user_k) == kernel_k i.e. if it's re-loaded back the compiled again value will be exactly the same as it was. That said, the user2_k can be calculated like this user2_k = reciprocal(kernel_k) with an exception, that if kernel_k == 0, then user2_k == 1. The optlen argument is treated like this -- when zero, kernel returns the amount of sock_fprog elements in filter, otherwise it should be large enough for the sock_fprog array. changes since v1: * Declared SO_GET_FILTER in all arch headers * Added decode of vlan-tag codes Signed-off-by: Pavel Emelyanov <xemul@parallels.com> Signed-off-by: David S. Miller <davem@davemloft.net>
76 lines
1.8 KiB
C
76 lines
1.8 KiB
C
#ifndef _ASM_SOCKET_H
|
|
#define _ASM_SOCKET_H
|
|
|
|
#include <asm/sockios.h>
|
|
|
|
/* For setsockopt(2) */
|
|
#define SOL_SOCKET 0xffff
|
|
|
|
#define SO_DEBUG 0x0001
|
|
#define SO_PASSCRED 0x0002
|
|
#define SO_REUSEADDR 0x0004
|
|
#define SO_KEEPALIVE 0x0008
|
|
#define SO_DONTROUTE 0x0010
|
|
#define SO_BROADCAST 0x0020
|
|
#define SO_PEERCRED 0x0040
|
|
#define SO_LINGER 0x0080
|
|
#define SO_OOBINLINE 0x0100
|
|
/* To add :#define SO_REUSEPORT 0x0200 */
|
|
#define SO_BSDCOMPAT 0x0400
|
|
#define SO_RCVLOWAT 0x0800
|
|
#define SO_SNDLOWAT 0x1000
|
|
#define SO_RCVTIMEO 0x2000
|
|
#define SO_SNDTIMEO 0x4000
|
|
#define SO_ACCEPTCONN 0x8000
|
|
|
|
#define SO_SNDBUF 0x1001
|
|
#define SO_RCVBUF 0x1002
|
|
#define SO_SNDBUFFORCE 0x100a
|
|
#define SO_RCVBUFFORCE 0x100b
|
|
#define SO_ERROR 0x1007
|
|
#define SO_TYPE 0x1008
|
|
#define SO_PROTOCOL 0x1028
|
|
#define SO_DOMAIN 0x1029
|
|
|
|
|
|
/* Linux specific, keep the same. */
|
|
#define SO_NO_CHECK 0x000b
|
|
#define SO_PRIORITY 0x000c
|
|
|
|
#define SO_BINDTODEVICE 0x000d
|
|
|
|
#define SO_ATTACH_FILTER 0x001a
|
|
#define SO_DETACH_FILTER 0x001b
|
|
#define SO_GET_FILTER SO_ATTACH_FILTER
|
|
|
|
#define SO_PEERNAME 0x001c
|
|
#define SO_TIMESTAMP 0x001d
|
|
#define SCM_TIMESTAMP SO_TIMESTAMP
|
|
|
|
#define SO_PEERSEC 0x001e
|
|
#define SO_PASSSEC 0x001f
|
|
#define SO_TIMESTAMPNS 0x0021
|
|
#define SCM_TIMESTAMPNS SO_TIMESTAMPNS
|
|
|
|
#define SO_MARK 0x0022
|
|
|
|
#define SO_TIMESTAMPING 0x0023
|
|
#define SCM_TIMESTAMPING SO_TIMESTAMPING
|
|
|
|
#define SO_RXQ_OVFL 0x0024
|
|
|
|
#define SO_WIFI_STATUS 0x0025
|
|
#define SCM_WIFI_STATUS SO_WIFI_STATUS
|
|
#define SO_PEEK_OFF 0x0026
|
|
|
|
/* Instruct lower device to use last 4-bytes of skb data as FCS */
|
|
#define SO_NOFCS 0x0027
|
|
|
|
|
|
/* Security levels - as per NRL IPv6 - don't actually do anything */
|
|
#define SO_SECURITY_AUTHENTICATION 0x5001
|
|
#define SO_SECURITY_ENCRYPTION_TRANSPORT 0x5002
|
|
#define SO_SECURITY_ENCRYPTION_NETWORK 0x5004
|
|
|
|
#endif /* _ASM_SOCKET_H */
|