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-rw-r--r--VNFs/DPPD-PROX/Makefile5
-rw-r--r--VNFs/DPPD-PROX/handle_ipv6_tunnel.c10
2 files changed, 15 insertions, 0 deletions
diff --git a/VNFs/DPPD-PROX/Makefile b/VNFs/DPPD-PROX/Makefile
index e9a4211b..3151f04f 100644
--- a/VNFs/DPPD-PROX/Makefile
+++ b/VNFs/DPPD-PROX/Makefile
@@ -105,6 +105,11 @@ else
CFLAGS += -DPROX_MAX_LOG_LVL=$(log)
endif
+# When ipv4 packet is de-encalpusled from ipv6 packet, genaerate IP checksum.
+ifeq ($(GEN_DECAP_IPV6_TO_IPV4_CKSUM),y)
+CFLAGS += -DGEN_DECAP_IPV6_TO_IPV4_CKSUM
+endif
+
# override any use-case/enviroment specific choices regarding crc and
# always use the sw implementation
ifeq ($(crc),soft)
diff --git a/VNFs/DPPD-PROX/handle_ipv6_tunnel.c b/VNFs/DPPD-PROX/handle_ipv6_tunnel.c
index a92f9cdc..3361a6a7 100644
--- a/VNFs/DPPD-PROX/handle_ipv6_tunnel.c
+++ b/VNFs/DPPD-PROX/handle_ipv6_tunnel.c
@@ -377,6 +377,8 @@ static int handle_ipv6_encap_bulk(struct task_base* tbase, struct rte_mbuf** mbu
static inline uint8_t handle_ipv6_decap(struct task_ipv6_decap* ptask, struct rte_mbuf* rx_mbuf, __attribute__((unused)) struct ipv6_tun_dest* tun_dest)
{
struct ether_hdr* peth = rte_pktmbuf_mtod(rx_mbuf, struct ether_hdr *);
+ struct task_ipv6_tun_base* tun_base = (struct task_ipv6_tun_base*)ptask;
+ struct ipv4_hdr* pip4 = NULL;
if (unlikely(peth->ether_type != ETYPE_IPv6)) {
plog_warn("Received non IPv6 packet on ipv6 tunnel port\n");
@@ -400,12 +402,20 @@ static inline uint8_t handle_ipv6_decap(struct task_ipv6_decap* ptask, struct rt
// Discard IPv6 encapsulation
rte_pktmbuf_adj(rx_mbuf, ipv6_hdr_len);
peth = rte_pktmbuf_mtod(rx_mbuf, struct ether_hdr *);
+ pip4 = (struct ipv4_hdr *)(peth + 1);
// Restore Ethernet header
ether_addr_copy(&ptask->base.src_mac, &peth->s_addr);
ether_addr_copy(&ptask->dst_mac, &peth->d_addr);
peth->ether_type = ETYPE_IPv4;
+#ifdef GEN_DECAP_IPV6_TO_IPV4_CKSUM
+ // generate an IP checksum for ipv4 packet
+ if (tun_base->runtime_flags & TASK_TX_CRC) {
+ prox_ip_cksum(rx_mbuf, pip4, sizeof(struct ether_hdr), sizeof(struct ipv4_hdr), ptask->base.offload_crc);
+ }
+#endif
+
return 0;
}