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Commit 1d5d236d authored by YOSHIFUJI Hideaki's avatar YOSHIFUJI Hideaki
Browse files

[IPV6]: Use bitfields for hop_limit and mcast_hops. 



Save some bits for future extensions.

Signed-off-by: default avatarYOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
parent 6b75d090

include/linux/ipv6.h

+24 −4
Original line number Diff line number Diff line
@@ -274,8 +274,29 @@ struct ipv6_pinfo { 


	__be32			flow_label;

	__u32			frag_size;

	__s16			hop_limit;

	__s16			mcast_hops;



	/*

	 * Packed in 16bits.

	 * Omit one shift by by putting the signed field at MSB.

	 */

#if defined(__BIG_ENDIAN_BITFIELD)

	__s16			hop_limit:9;

	__u16			__unused_1:7;

#else

	__u16			__unused_1:7;

	__s16			hop_limit:9;

#endif



#if defined(__BIG_ENDIAN_BITFIELD)

	/* Packed in 16bits. */

	__s16			mcast_hops:9;

	__u16			__unused_2:6,

				mc_loop:1;

#else

	__u16			mc_loop:1,

				__unused_2:6;

	__s16			mcast_hops:9;

#endif

	int			mcast_oif;



	/* pktoption flags */
@@ -298,8 +319,7 @@ struct ipv6_pinfo { 
	} rxopt;



	/* sockopt flags */

	__u8			mc_loop:1,

	                        recverr:1,

	__u8			recverr:1,

	                        sndflow:1,

				pmtudisc:2,

				ipv6only:1;