sctp: Add peeloff-flags socket option

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

Neil Horman committed 9 years ago

Commit 2cb5c8e1 parent 15324b22 files · +78 −15Browse files

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include/uapi/linux/sctp.h+6−0

@@ -121,6 +121,7 @@ typedef __s32 sctp_assoc_t; · 120 unmodified lines
121	121	#define SCTP_RESET_STREAMS 119
122	122	#define SCTP_RESET_ASSOC 120
123	123	#define SCTP_ADD_STREAMS 121
	124	+#define SCTP_SOCKOPT_PEELOFF_FLAGS 122
124	125
125	126	/* PR-SCTP policies */
126	127	#define SCTP_PR_SCTP_NONE 0x0000
@@ -978,6 +979,11 @@ typedef struct { · 851 unmodified lines
978	979	int sd;
979	980	} sctp_peeloff_arg_t;
980	981
	982	+typedef struct {
	983	+ sctp_peeloff_arg_t p_arg;
	984	+ unsigned flags;
	985	+} sctp_peeloff_flags_arg_t;
	986	+
981	987	/*
982	988	* Peer Address Thresholds socket option
983	989	*/