NET_ISVALIDCHECKSUM(9F) Kernel Functions for Drivers

NAME

net_isvalidchecksum - verify layer 3 and layer 4 checksums

SYNOPSIS

#include <sys/neti.h>

int net_isvalidchecksum(const net_data_t net, mblk_t *mb);

INTERFACE LEVEL

illumos DDI specific (illumos DDI).

PARAMETERS

net
value returned from a successful call to
net_protocol_lookup(9F).


mb
the mblk structure holding a packet that is the subject of this
query.

DESCRIPTION

The net_isvalidchecksum() function verifies the layer 3 checksum
(and, in some case, the layer 4 checksum) in the packet. If possible,
fields that are used by hardware checksum'ing are examined rather
than manually verifying that the checksums are present for packets
received from a network interface.


For both IPv4 and IPv6, TCP, UDP and ICMP (including ICMPV6 for IPv6)
layer 4 checksums are currently validated.

RETURN VALUES

The net_isvalidchecksum() function returns:

-1
The network protocol does not support this function.


0
The packet does not contain partial checksums.


1
The packet does contain partial checksums.

CONTEXT

The net_isvalidchecksum() function may be called from user, kernel,
or interrupt context.

ATTRIBUTES

See attributes(7) for descriptions of the following attributes:


+--------------------+-----------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+--------------------+-----------------+
|Interface Stability | Committed |
+--------------------+-----------------+

SEE ALSO

attributes(7), net_ispartialchecksum(9F), net_protocol_lookup(9F)

May 1, 2008 NET_ISVALIDCHECKSUM(9F)