Hi, We found a bug in IPv6 code. Issue was realized when TFTP download stopped while chsum value was being rolled over.
Problem is in IPv6/UDP cksum calculation logic. Made it compliant to RFC2460 fixed the issue. Signed-off-by: TAKENAGA Yoshinobu <[email protected]> --- src/net/ipv6.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/src/net/ipv6.c b/src/net/ipv6.c index c5bead1..5fc61df 100644 --- a/src/net/ipv6.c +++ b/src/net/ipv6.c @@ -523,6 +523,9 @@ static int ipv6_tx ( struct io_buffer *iobuf, *trans_csum = ipv6_pshdr_chksum ( iphdr, len, tcpip_protocol->tcpip_proto, *trans_csum ); + /* RFC 2460 8.1: IPV6/UDP csum can't be zero */ + if ( *trans_csum == 0 && tcpip_protocol->tcpip_proto == IP_UDP ) + *trans_csum = 0xFFFF; } /* Print IPv6 header for debugging */ -- 1.9.1 // Thanks, // Takenaga _______________________________________________ ipxe-devel mailing list [email protected] https://lists.ipxe.org/mailman/listinfo.cgi/ipxe-devel
