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| author | imp <imp@FreeBSD.org> | 2006-12-31 21:34:53 +0000 |
|---|---|---|
| committer | imp <imp@FreeBSD.org> | 2006-12-31 21:34:53 +0000 |
| commit | 426d73c7621f2b4a511a83b5c445ad540b824330 (patch) | |
| tree | 75ceee608be7cbb7222afa24cc2bbe7aac71e01c /sys/netinet/udp_usrreq.c | |
| parent | b790270fcf047b99270bdf23da783ad7e7551b43 (diff) | |
| download | FreeBSD-src-426d73c7621f2b4a511a83b5c445ad540b824330.zip FreeBSD-src-426d73c7621f2b4a511a83b5c445ad540b824330.tar.gz | |
Add comment about udp checksums being off in BSD 4.2 compatibility mode.
Submitted by: Dr. Markus Waldeck
PR: kern/106657
Diffstat (limited to 'sys/netinet/udp_usrreq.c')
| -rw-r--r-- | sys/netinet/udp_usrreq.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/sys/netinet/udp_usrreq.c b/sys/netinet/udp_usrreq.c index 52c4af5..701fe73 100644 --- a/sys/netinet/udp_usrreq.c +++ b/sys/netinet/udp_usrreq.c @@ -93,10 +93,17 @@ * UDP protocol implementation. * Per RFC 768, August, 1980. */ + +/* + * BSD 4.2 defaulted the udp checksum to be off. Turning off udp + * checksums removes the only data integrety mechanism for packets and + * malformed packets that would otherwise be discarded by bad checksums + * may cause problems (espeically for NFS data blocks). + */ #ifndef COMPAT_42 static int udpcksum = 1; #else -static int udpcksum = 0; /* XXX */ +static int udpcksum = 0; #endif SYSCTL_INT(_net_inet_udp, UDPCTL_CHECKSUM, checksum, CTLFLAG_RW, &udpcksum, 0, ""); |
