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net: ipv6: mld: get rid of MLDV2_MRC and simplify calculation

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Get rid of MLDV2_MRC and use our new macros for mantisse and
exponent to calculate Maximum Response Delay out of the Maximum
Response Code.

Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
Cc: Hannes Frederic Sowa <hannes@stressinduktion.org>
Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Daniel Borkmann 2013-09-04 00:19:39 +02:00 • committed by David S. Miller
parent 6c567b78c8
commit e3f5b17047
3 changed files with 23 additions and 26 deletions
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28
include/net/mld.h
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@ -63,15 +63,6 @@ struct mld2_query {
#define mld2q_mrc mld2q_hdr.icmp6_maxdelay
#define mld2q_resv1 mld2q_hdr.icmp6_dataun.un_data16[1]
/* Max Response Code, TODO: transform this to use the below */
#define MLDV2_MASK(value, nb) ((nb)>=32 ? (value) : ((1<<(nb))-1) & (value))
#define MLDV2_EXP(thresh, nbmant, nbexp, value) \
((value) < (thresh) ? (value) : \
((MLDV2_MASK(value, nbmant) | (1<<(nbmant))) << \
(MLDV2_MASK((value) >> (nbmant), nbexp) + (nbexp))))
#define MLDV2_MRC(value) MLDV2_EXP(0x8000, 12, 3, value)
/* RFC3810, 5.1.3. Maximum Response Code:
*
* If Maximum Response Code >= 32768, Maximum Response Code represents a
@ -97,4 +88,23 @@ struct mld2_query {
#define MLDV2_QQIC_EXP(value) (((value) >> 4) & 0x07)
#define MLDV2_QQIC_MAN(value) ((value) & 0x0f)
static inline unsigned long mldv2_mrc(const struct mld2_query *mlh2)
{
/* RFC3810, 5.1.3. Maximum Response Code */
unsigned long ret, mc_mrc = ntohs(mlh2->mld2q_mrc);
if (mc_mrc < 32768) {
ret = mc_mrc;
} else {
unsigned long mc_man, mc_exp;
mc_exp = MLDV2_MRC_EXP(mc_mrc);
mc_man = MLDV2_MRC_MAN(mc_mrc);
ret = (mc_man | 0x1000) << (mc_exp + 3);
}
return ret;
}
#endif