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ipv6: Introduce ip6_flow_hdr() to fill version, tclass and flowlabel.

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This is not only for readability but also for optimization.
What we do here is to build the 32bit word at the beginning of the ipv6
header (the "ip6_flow" virtual member of struct ip6_hdr in RFC3542) and
we do not need to read the tclass portion of the target buffer.

Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
YOSHIFUJI Hideaki / 吉藤英明
2013-01-13 05:01:39 +00:00
committed by David S. Miller
parent 00494be454
commit 3e4e4c1f2d
5 changed files with 16 additions and 13 deletions
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9
include/net/ipv6.h
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@@ -546,6 +546,15 @@ static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_add
extern void ipv6_select_ident(struct frag_hdr *fhdr, struct rt6_info *rt);
/*
* Header manipulation
*/
static inline void ip6_flow_hdr(struct ipv6hdr *hdr, unsigned int tclass,
__be32 flowlabel)
{
*(__be32 *)hdr = ntohl(0x60000000 | (tclass << 20)) | flowlabel;
}
/*
* Prototypes exported by ipv6
*/