opensolaris man page for net_isvalidchecksum

net_isvalidchecksum(9F) 				   Kernel Functions for Drivers 				   net_isvalidchecksum(9F)

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
       Solaris DDI specific (Solaris 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(5) for descriptions of the following attributes:

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

SEE ALSO
       net_ispartialchecksum(9F), net_protocol_lookup(9F), attributes(5)

SunOS 5.11							    1 May 2008						   net_isvalidchecksum(9F)