Kernel functions			     net_isvalidcksum(9F)



NAME
     net_isvalidcksum -	verify layer  3	 and  layer  4	checksums
     where possible

SYNOPSIS
     #include <sys/neti.h>

     int net_isvalidcksum(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.



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



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

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

RETURN VALUES
     This interface returns "-1" if it is not support by the net-
     work  protocol,  0	 if  the  packet does not contain partial
     checksums and 1 if	it does.

ATTRIBUTES
     See attributes(5) for descriptions	of the	following  attri-
     butes:
	  ____________________________________________________________
	 |	 ATTRIBUTE TYPE	       |       ATTRIBUTE VALUE	     |
	 |_____________________________|_____________________________|
	 | Interface Stability	       |	 Committed	     |
	 |_____________________________|_____________________________|

SEE ALSO
     net_ispartialcksum(9f)




SunOS 5.10	   Last	change:	25 March 2008			1