提交 1d5d236d 编写于 作者: Y YOSHIFUJI Hideaki

[IPV6]: Use bitfields for hop_limit and mcast_hops.

Save some bits for future extensions.
Signed-off-by: NYOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
上级 6b75d090
......@@ -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;
......
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