Dear all, I have a question related to layer 4 checksum. I am creating a UDP packet by appending the layers in order (udp, ipv4, Eth). However, when I run Wireshark on the receiving end I get: [UDPchecksum = missing (nor present]. Whereas, the checksum for ipv4 works fine. Here is what I do:
.... Filling udp header ..... Struct udp_hdr *udp=(struct udp_hdr*)rte_pktmbuf_prepend(mbuf, sizeof(*udp)); Udp->dgram_cksum=0; Ipv4->hdr->hdr_cksum=0; Udp->dgram_cksum= rte_ipv4_udptcp_cksum((const struct ipv4_hdr *)ipv4_hdr, (const void *)udp); Ipv4_hdr->hdr_cksum= rte_ipv4_cksum((const struct ipv4_hdr *)ipv4_hdr); --- continue filling ipv4 fields ... Does anyone have an idea why rte_ipv4_udptcp_cksum() not working? Thank you, Siham
