I have un issue with calculating the checksum for IPv6 packet in the linux kernel module.
I tried the next way:
Code:
struct in6_addr LINK_LOCAL_MULTICAST = {{{ 0xff,02,0,0,0,0,0,0,0,0,0,0,0,1,0,2 }}};
struct in6_addr LINK_LOCAL_SRC = {{{ 0xfe,0x80,0,0,0,0,0,0,0x0a,0x00,0x27,0xff,0xfe,0x5b,0x58,0xcf }}};
udph->len = htons(sizeof(struct udphdr)+sizeof(struct udp_payload));
__wsum csum = csum_partial((char*) udph, udhp->len, 0);
udph->check = csum_ipv6_magic(&LINK_LOCAL_SRC, &LINK_LOCAL_MULTICAST, udph->len, IPPROTO_UDP,csum);
Please find the packet in wireshark. I changed the offload settings(tx,rx) but the checksum still incorrect. Could you please suggest what I have to change to get correct checksum.
Wireshark image capture
