netdev - [PATCH v2 iproute2] tc: fix ipv6 filter selector attribute for some prefix lengths

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Message-ID: <20171001031840.1252538-1-hex@fb.com>
Date:   Sat, 30 Sep 2017 20:18:40 -0700
From:   Yulia Kartseva <hex@...com>
To:     <stephen@...workplumber.org>
CC:     <netdev@...r.kernel.org>, <yulia.kartseva@...il.com>, <hex@...com>
Subject: [PATCH v2 iproute2] tc: fix ipv6 filter selector attribute for some prefix lengths

Wrong TCA_U32_SEL attribute packing if prefixLen AND 0x1f equals 0x1f.
These are  /31, /63, /95 and /127 prefix lengths.

Example:
ip6 dst face:b00f::/31
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

v2: previous patch was made with a wrong repo

Signed-off-by: Yulia Kartseva <hex@...com>
---
 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)
-- 
2.9.5