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authorYan Zheng <yanzheng@21cn.com>2005-10-28 12:02:32 -0400
committerArnaldo Carvalho de Melo <acme@mandriva.com>2005-10-28 14:35:18 -0400
commitf12baeab9d65e2fe1b43b09b666f5efcb81b9369 (patch)
tree88e06b93cad95fef0ebb4a60d2b195884fe79d4f /net
parente89e9cf539a28df7d0eb1d0a545368e9920b34ac (diff)
[MCAST] IPv6: Fix algorithm to compute Querier's Query Interval
5.1.3. Maximum Response Code The Maximum Response Code field specifies the maximum time allowed before sending a responding Report. The actual time allowed, called the Maximum Response Delay, is represented in units of milliseconds, and is derived from the Maximum Response Code as follows: If Maximum Response Code < 32768, Maximum Response Delay = Maximum Response Code If Maximum Response Code >=32768, Maximum Response Code represents a floating-point value as follows: 0 1 2 3 4 5 6 7 8 9 A B C D E F +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |1| exp | mant | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Maximum Response Delay = (mant | 0x1000) << (exp+3) 5.1.9. QQIC (Querier's Query Interval Code) The Querier's Query Interval Code field specifies the [Query Interval] used by the Querier. The actual interval, called the Querier's Query Interval (QQI), is represented in units of seconds, and is derived from the Querier's Query Interval Code as follows: If QQIC < 128, QQI = QQIC If QQIC >= 128, QQIC represents a floating-point value as follows: 0 1 2 3 4 5 6 7 +-+-+-+-+-+-+-+-+ |1| exp | mant | +-+-+-+-+-+-+-+-+ QQI = (mant | 0x10) << (exp + 3) -- rfc3810 #define MLDV2_QQIC(value) MLDV2_EXP(0x80, 4, 3, value) #define MLDV2_MRC(value) MLDV2_EXP(0x8000, 12, 3, value) Above macro are defined in mcast.c. but 1 << 4 == 0x10 and 1 << 12 == 0x1000. So the result computed by original Macro is larger. Signed-off-by: Yan Zheng <yanzheng@21cn.com> Acked-by: David L Stevens <dlstevens@us.ibm.com> Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Diffstat (limited to 'net')
-rw-r--r--net/ipv6/mcast.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/ipv6/mcast.c b/net/ipv6/mcast.c
index 39a96c768102..c4f2a0ef7489 100644
--- a/net/ipv6/mcast.c
+++ b/net/ipv6/mcast.c
@@ -164,7 +164,7 @@ static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
164#define MLDV2_MASK(value, nb) ((nb)>=32 ? (value) : ((1<<(nb))-1) & (value)) 164#define MLDV2_MASK(value, nb) ((nb)>=32 ? (value) : ((1<<(nb))-1) & (value))
165#define MLDV2_EXP(thresh, nbmant, nbexp, value) \ 165#define MLDV2_EXP(thresh, nbmant, nbexp, value) \
166 ((value) < (thresh) ? (value) : \ 166 ((value) < (thresh) ? (value) : \
167 ((MLDV2_MASK(value, nbmant) | (1<<(nbmant+nbexp))) << \ 167 ((MLDV2_MASK(value, nbmant) | (1<<(nbmant))) << \
168 (MLDV2_MASK((value) >> (nbmant), nbexp) + (nbexp)))) 168 (MLDV2_MASK((value) >> (nbmant), nbexp) + (nbexp))))
169 169
170#define MLDV2_QQIC(value) MLDV2_EXP(0x80, 4, 3, value) 170#define MLDV2_QQIC(value) MLDV2_EXP(0x80, 4, 3, value)