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The default for UDPLITE_RECV_CSCOV is zero. RFC 3828 recommend

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that this means full checksum coverage for received packets.
If an application is willing to accept packets with partial
coverage, it is expected to use the socekt option and provice
the minimum coverage it accepts.

Reviewed by: kevlo
MFC after: 3 days
This commit is contained in:
tuexen 2014-10-01 05:43:29 +00:00
parent 39a5d322fa
commit 911b31bff0
3 changed files with 12 additions and 12 deletions
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18
share/man/man4/udplite.4
View File

@ -24,7 +24,7 @@
.\"
.\" $FreeBSD$
.\"
.Dd April 7, 2014
.Dd October 1, 2014
.Dt UDPLITE 4
.Os
.Sh NAME
@ -55,16 +55,16 @@ and tested with
.Bl -tag -width ".Dv UDPLITE_SEND_CSCOV"
.It Dv UDPLITE_SEND_CSCOV
This option sets the sender checksum coverage.
A value of zero indicates that the entire packet
is covered by the checksum.
A value of 1 to 7 must be discarded by the receiver.
A value of zero indicates that all sent packets will have
full checksum coverage.
A value of 8 to 65535 limits the checksum coverage of all sent packets
to the value given.
.It Dv UDPLITE_RECV_CSCOV
This option is the receiver-side analogue.
It is truly optional, i.e. not required to enable traffic
with partial checksum coverage.
Its function is that of a traffic filter:
when enabled, it instructs the kernel to drop
all packets which have a coverage less than this value.
A value of zero instructs the kernel to drop all received packets
not having full checksum coverage.
A value of 8 to 65535 instructs the kernel to drop all received
packets with a partial checksum coverage smaller than the value specified.
.El
.Sh ERRORS
A socket operation may fail with one of the following errors returned:

2
sys/netinet/udp_usrreq.c
View File

@ -689,7 +689,7 @@ udp_input(struct mbuf **mp, int *offp, int proto)
struct udpcb *up;
up = intoudpcb(inp);
if (up->u_rxcslen > len) {
if (up->u_rxcslen == 0 || up->u_rxcslen > len) {
INP_RUNLOCK(inp);
m_freem(m);
return (IPPROTO_DONE);

4
sys/netinet6/udp6_usrreq.c
View File

@ -261,7 +261,7 @@ udp6_input(struct mbuf **mp, int *offp, int proto)
if (uh_sum != 0) {
UDPSTAT_INC(udps_badsum);
goto badunlocked;
/*goto badunlocked;*/
}
/*
@ -481,7 +481,7 @@ udp6_input(struct mbuf **mp, int *offp, int proto)
INP_RLOCK_ASSERT(inp);
up = intoudpcb(inp);
if (cscov_partial) {
if (up->u_rxcslen > ulen) {
if (up->u_rxcslen == 0 || up->u_rxcslen > ulen) {
INP_RUNLOCK(inp);
m_freem(m);
return (IPPROTO_DONE);