[dpdk-dev] [PATCH v3 2/4] ip_frag: ensure minimum v6 fragmentation length

[Aaron Conole]

Similar to v4, we should ensure that at least a minimum fragmentation
length can be achieved.

Signed-off-by: Aaron Conole <aconole at redhat.com>
---
 lib/librte_ip_frag/rte_ipv6_fragmentation.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/lib/librte_ip_frag/rte_ipv6_fragmentation.c b/lib/librte_ip_frag/rte_ipv6_fragmentation.c
index 43449970e5..820a5dc725 100644
--- a/lib/librte_ip_frag/rte_ipv6_fragmentation.c
+++ b/lib/librte_ip_frag/rte_ipv6_fragmentation.c
@@ -79,6 +79,17 @@ rte_ipv6_fragment_packet(struct rte_mbuf *pkt_in,
 	uint16_t fragment_offset, frag_size;
 	uint64_t frag_bytes_remaining;
 
+	/*
+	 * The rules on ipv6 fragmentation means we need at least to be
+	 * greater than the smallest fragment possible - ipv6hdr + frag header
+	 * + min octets.  We rely on the ipv6_extension_fragment header to
+	 * include 'data' octets.
+	 */
+	if (unlikely(mtu_size <
+		     (sizeof(struct rte_ipv6_hdr) +
+		      sizeof(struct ipv6_extension_fragment))))
+		return -EINVAL;
+
 	/*
 	 * Ensure the IP payload length of all fragments (except the
 	 * the last fragment) are a multiple of 8 bytes per RFC2460.
-- 
2.25.1