[dpdk-dev] [PATCH v2] app/testpmd: fix mpls encap ipv4 version and ihl

[Saleh Alsouqi]

According to ietf rfc791 (see [1])

    "The Version field indicates the format of the
    internet header."

    "Internet Header Length (ihl) is the length of the
    internet header in 32 bit words, and thus points
    to the beginning of the data. Note that
    the minimum value for a correct header is 5."

Having version and ihl set to 0 would result in a
corrupted/incorrect encapsulating packet for MPLS,
this commit sets these fields to 4 and 5 respectively
as a default value.

[1] https://tools.ietf.org/html/rfc791

Fixes: 3e77031be855 ("app/testpmd: add MPLSoGRE encapsulation")
Fixes: a1191d39cb57 ("app/testpmd: add MPLSoUDP encapsulation")
Cc: stable at dpdk.org

Signed-off-by: Saleh Alsouqi <salehals at mellanox.com>
---
v2:
        - Include netinet/ip.h in librte_net/rte_ip.h
          to use existing definitions instead of defining
          our own.

        - Move definitions from testpmd.h to librte_net/rte_ip.h
---
 app/test-pmd/cmdline_flow.c | 6 ++++++
 lib/librte_net/rte_ip.h     | 5 +++++
 2 files changed, 11 insertions(+)

diff --git a/app/test-pmd/cmdline_flow.c b/app/test-pmd/cmdline_flow.c
index 36659a64a..f536307c9 100644
--- a/app/test-pmd/cmdline_flow.c
+++ b/app/test-pmd/cmdline_flow.c
@@ -3767,11 +3767,14 @@ parse_vc_action_mplsogre_encap(struct context *ctx, const struct token *token,
 			.src_addr = mplsogre_encap_conf.ipv4_src,
 			.dst_addr = mplsogre_encap_conf.ipv4_dst,
 			.next_proto_id = IPPROTO_GRE,
+			.version_ihl = IPV4_VHL_DEF,
+			.time_to_live = IPDEFTTL,
 		},
 	};
 	struct rte_flow_item_ipv6 ipv6 = {
 		.hdr =  {
 			.proto = IPPROTO_GRE,
+			.hop_limits = IPDEFTTL,
 		},
 	};
 	struct rte_flow_item_gre gre = {
@@ -3955,11 +3958,14 @@ parse_vc_action_mplsoudp_encap(struct context *ctx, const struct token *token,
 			.src_addr = mplsoudp_encap_conf.ipv4_src,
 			.dst_addr = mplsoudp_encap_conf.ipv4_dst,
 			.next_proto_id = IPPROTO_UDP,
+			.version_ihl = IPV4_VHL_DEF,
+			.time_to_live = IPDEFTTL,
 		},
 	};
 	struct rte_flow_item_ipv6 ipv6 = {
 		.hdr =  {
 			.proto = IPPROTO_UDP,
+			.hop_limits = IPDEFTTL,
 		},
 	};
 	struct rte_flow_item_udp udp = {
diff --git a/lib/librte_net/rte_ip.h b/lib/librte_net/rte_ip.h
index f9b909090..499a2f79c 100644
--- a/lib/librte_net/rte_ip.h
+++ b/lib/librte_net/rte_ip.h
@@ -17,6 +17,7 @@
 
 #include <stdint.h>
 #include <netinet/in.h>
+#include <netinet/ip.h>
 
 #include <rte_byteorder.h>
 #include <rte_mbuf.h>
@@ -89,6 +90,10 @@ struct ipv4_hdr {
 #define IS_IPV4_MCAST(x) \
 	((x) >= IPV4_MIN_MCAST && (x) <= IPV4_MAX_MCAST) /**< check if IPv4 address is multicast */
 
+/* IPv4 default fields values */
+#define IPV4_MIN_IHL    (0x5)
+#define IPV4_VHL_DEF    (IPVERSION | IPV4_MIN_IHL)
+
 /**
  * @internal Calculate a sum of all words in the buffer.
  * Helper routine for the rte_raw_cksum().
-- 
2.17.1