On 01/05/2026 20:31, Ujjal Roy wrote:
In IGMP, MRC and QQIC fields are not correctly encoded when generating query packets. Since the receiver of the query interprets these fields using the IGMPv3 floating- point decoding logic, any value that exceeds the linear threshold is incorrectly parsed as an exponential value, leading to an incorrect interval calculation.Encode and assign the corresponding protocol fields during query generation. Introduce the logic to dynamically calculate the exponent and mantissa using bit-scan (fls). This ensures MRC and QQIC fields (8-bit) are properly encoded when transmitting query packets with intervals that exceed their respective linear threshold value of 128 (for MRT/QQI). RFC3376: for both MRC and QQIC, values >= 128 represent the same floating-point encoding as follows: 0 1 2 3 4 5 6 7 +-+-+-+-+-+-+-+-+ |1| exp | mant | +-+-+-+-+-+-+-+-+ Reviewed-by: Ido Schimmel <[email protected]> Signed-off-by: Ujjal Roy <[email protected]> --- include/linux/igmp.h | 87 +++++++++++++++++++++++++++++++++++++++ net/bridge/br_multicast.c | 14 +++---- 2 files changed, 93 insertions(+), 8 deletions(-)
Reviewed-by: Nikolay Aleksandrov <[email protected]>
