[dpdk-stable] [PATCH] ip_frag: fix IPv6 fragment size calculation

[Konstantin Ananyev]

Take into account IPv6 fragment extension header when
calculating data size for each fragment.

Fixes: 7a838c8798a9 ("ip_frag: fix IPv6 when MTU sizes not aligned to 8 bytes")
Fixes: 0aa31d7a5929 ("ip_frag: add IPv6 fragmentation support")
Cc: stable at dpdk.org

Signed-off-by: Konstantin Ananyev <konstantin.ananyev at intel.com>
---
 lib/librte_ip_frag/rte_ipv6_fragmentation.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/lib/librte_ip_frag/rte_ipv6_fragmentation.c b/lib/librte_ip_frag/rte_ipv6_fragmentation.c
index bfe44d435..43449970e 100644
--- a/lib/librte_ip_frag/rte_ipv6_fragmentation.c
+++ b/lib/librte_ip_frag/rte_ipv6_fragmentation.c
@@ -83,8 +83,10 @@ rte_ipv6_fragment_packet(struct rte_mbuf *pkt_in,
 	 * Ensure the IP payload length of all fragments (except the
 	 * the last fragment) are a multiple of 8 bytes per RFC2460.
 	 */
-	frag_size = RTE_ALIGN_FLOOR(mtu_size - sizeof(struct rte_ipv6_hdr),
-				    RTE_IPV6_EHDR_FO_ALIGN);
+
+	frag_size = mtu_size - sizeof(struct rte_ipv6_hdr) -
+		sizeof(struct ipv6_extension_fragment);
+	frag_size = RTE_ALIGN_FLOOR(frag_size, RTE_IPV6_EHDR_FO_ALIGN);
 
 	/* Check that pkts_out is big enough to hold all fragments */
 	if (unlikely (frag_size * nb_pkts_out <
-- 
2.17.1