On Mon, 25 Sep 2017 11:12:38 -0700
Yulia Kartseva <yulia.karts...@gmail.com> wrote:
> Wrong TCA_U32_SEL attribute packing if prefixLen AND 0x1f equals 0x1f.
> These are /31, /63, /95 and /127 prefix lengths.
>
> Example:
> # tc filter add dev eth0 protocol ipv6 parent b: prio 2307 u32 match
> ip6 dst face:b00f::/31
> # tc filter show dev eth0
> filter parent b: protocol ipv6 pref 2307 u32
> filter parent b: protocol ipv6 pref 2307 u32 fh 800: ht divisor 1
> filter parent b: protocol ipv6 pref 2307 u32 fh 800::800 order 2048
> key ht 800 bkt 0
> match faceb00f/ffffffff at 24
>
>
> The correct match would be "faceb00e/fffffffe": don't count the last
> bit of the 4th byte as the network prefix. With fix:
>
> # tc filter show dev eth0
> filter parent b: protocol ipv6 pref 2307 u32
> filter parent b: protocol ipv6 pref 2307 u32 fh 800: ht divisor 1
> filter parent b: protocol ipv6 pref 2307 u32 fh 800::800 order 2048
> key ht 800 bkt 0
> match faceb00e/fffffffe at 24
>
> tc/f_u32.c | 3 +--
> 1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/tc/f_u32.c b/tc/f_u32.c
> index 5815be9..14b9588 100644
> --- a/tc/f_u32.c
> +++ b/tc/f_u32.c
> @@ -385,8 +385,7 @@ static int parse_ip6_addr(int *argc_p, char ***argv_p,
>
> plen = addr.bitlen;
> for (i = 0; i < plen; i += 32) {
> - /* if (((i + 31) & ~0x1F) <= plen) { */
> - if (i + 31 <= plen) {
> + if (i + 31 < plen) {
> res = pack_key(sel, addr.data[i / 32],
> 0xFFFFFFFF, off + 4 * (i / 32), offmask);
> if (res < 0)
This patch looks correct, but will not apply cleanly because
the mail system that you submitted it with is removing whitespace.
If possible use a different client, or send as an attachment.
