[dpdk-dev] [PATCH] net/i40e: illegal pactket checking

[Yanglong Wu <yanglong.wu@intel.com>]

Some illegal packets will lead to TX/RX hang and
can't recover automatically. This patch check those
illegal packets and protect TX/RX from hanging.

Signed-off-by: Yanglong Wu <yanglong.wu@intel.com>
---
v2:
fix coding style issue and spelling error
---
v3:
rework as comments
---
 drivers/net/i40e/i40e_rxtx.c | 15 +++++++++++----
 drivers/net/i40e/i40e_rxtx.h |  2 ++
 2 files changed, 13 insertions(+), 4 deletions(-)

diff --git a/drivers/net/i40e/i40e_rxtx.c b/drivers/net/i40e/i40e_rxtx.c
index 6032d5541..e7916f99c 100644
--- a/drivers/net/i40e/i40e_rxtx.c
+++ b/drivers/net/i40e/i40e_rxtx.c
@@ -1439,13 +1439,13 @@ i40e_prep_pkts(__rte_unused void *tx_queue, struct rte_mbuf **tx_pkts,
 
 		/* Check for m->nb_segs to not exceed the limits. */
 		if (!(ol_flags & PKT_TX_TCP_SEG)) {
-			if (m->nb_segs > I40E_TX_MAX_SEG ||
-			    m->nb_segs > I40E_TX_MAX_MTU_SEG) {
+			if (m->nb_segs > I40E_TX_MAX_MTU_SEG) {
 				rte_errno = -EINVAL;
 				return i;
 			}
-		} else if ((m->tso_segsz < I40E_MIN_TSO_MSS) ||
-				(m->tso_segsz > I40E_MAX_TSO_MSS)) {
+		} else if (m->nb_segs > I40E_TX_MAX_SEG ||
+			   m->tso_segsz < I40E_MIN_TSO_MSS ||
+			   m->tso_segsz > I40E_MAX_TSO_MSS) {
 			/* MSS outside the range (256B - 9674B) are considered
 			 * malicious
 			 */
@@ -1458,6 +1458,13 @@ i40e_prep_pkts(__rte_unused void *tx_queue, struct rte_mbuf **tx_pkts,
 			return i;
 		}
 
+		/* check the size of packet */
+		if (m->pkt_len > I40E_FRAME_SIZE_MAX ||
+		    m->pkt_len < I40E_TX_MIN_PKT_LEN) {
+			rte_errno = -EINVAL;
+			return i;
+		}
+
 #ifdef RTE_LIBRTE_ETHDEV_DEBUG
 		ret = rte_validate_tx_offload(m);
 		if (ret != 0) {
diff --git a/drivers/net/i40e/i40e_rxtx.h b/drivers/net/i40e/i40e_rxtx.h
index ea73a8a1b..3fc619af9 100644
--- a/drivers/net/i40e/i40e_rxtx.h
+++ b/drivers/net/i40e/i40e_rxtx.h
@@ -30,6 +30,8 @@
 #define I40E_TX_MAX_SEG     UINT8_MAX
 #define I40E_TX_MAX_MTU_SEG 8
 
+#define I40E_TX_MIN_PKT_LEN 17
+
 #undef container_of
 #define container_of(ptr, type, member) ({ \
 		typeof(((type *)0)->member)(*__mptr) = (ptr); \
-- 
2.11.0