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sctp: Add peeloff-flags socket option

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Based on a request raised on the sctp devel list, there is a need to
augment the sctp_peeloff operation while specifying the O_CLOEXEC and
O_NONBLOCK flags (simmilar to the socket syscall).  Since modifying the
SCTP_SOCKOPT_PEELOFF socket option would break user space ABI for existing
programs, this patch creates a new socket option
SCTP_SOCKOPT_PEELOFF_FLAGS, which accepts a third flags parameter to
allow atomic assignment of the socket descriptor flags.

Tested successfully by myself and the requestor

Signed-off-by: Neil Horman <nhorman@tuxdriver.com>
CC: Vlad Yasevich <vyasevich@gmail.com>
CC: "David S. Miller" <davem@davemloft.net>
CC: Andreas Steinmetz <ast@domdv.de>
CC: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Neil Horman 2017-06-30 13:32:57 -04:00 • committed by David S. Miller
parent 15324b25d5
commit 2cb5c8e378
2 changed files with 84 additions and 21 deletions
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6
include/uapi/linux/sctp.h
View file

@ -121,6 +121,7 @@ typedef __s32 sctp_assoc_t;
#define SCTP_RESET_STREAMS 119
#define SCTP_RESET_ASSOC 120
#define SCTP_ADD_STREAMS 121
#define SCTP_SOCKOPT_PEELOFF_FLAGS 122
/* PR-SCTP policies */
#define SCTP_PR_SCTP_NONE 0x0000
@ -978,6 +979,11 @@ typedef struct {
int sd;
} sctp_peeloff_arg_t;
typedef struct {
sctp_peeloff_arg_t p_arg;
unsigned flags;
} sctp_peeloff_flags_arg_t;
/*
* Peer Address Thresholds socket option
*/