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ipv6: Optmize translation between IPV6_PREFER_SRC_xxx and RT6_LOOKUP_F_xxx.

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IPV6_PREFER_SRC_xxx definitions:
| #define IPV6_PREFER_SRC_TMP             0x0001
| #define IPV6_PREFER_SRC_PUBLIC          0x0002
| #define IPV6_PREFER_SRC_COA             0x0004

RT6_LOOKUP_F_xxx definitions:
| #define RT6_LOOKUP_F_SRCPREF_TMP        0x00000008
| #define RT6_LOOKUP_F_SRCPREF_PUBLIC     0x00000010
| #define RT6_LOOKUP_F_SRCPREF_COA        0x00000020

So, we can translate between these two groups by shift operation
instead of multiple 'if's.

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
2010-03-07 00:14:44 +00:00
committed by David S. Miller
parent 25dc27d17d
commit 0c9a2ac1f8
3 changed files with 22 additions and 18 deletions
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11
net/ipv6/route.c
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@@ -819,15 +819,8 @@ struct dst_entry * ip6_route_output(struct net *net, struct sock *sk,
if (!ipv6_addr_any(&fl->fl6_src))
flags |= RT6_LOOKUP_F_HAS_SADDR;
else if (sk) {
unsigned int prefs = inet6_sk(sk)->srcprefs;
if (prefs & IPV6_PREFER_SRC_TMP)
flags |= RT6_LOOKUP_F_SRCPREF_TMP;
if (prefs & IPV6_PREFER_SRC_PUBLIC)
flags |= RT6_LOOKUP_F_SRCPREF_PUBLIC;
if (prefs & IPV6_PREFER_SRC_COA)
flags |= RT6_LOOKUP_F_SRCPREF_COA;
}
else if (sk)
flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs);
return fib6_rule_lookup(net, fl, flags, ip6_pol_route_output);
}