Manual Pages for UNIX Operating System command usage for man net_isvalidchecksum

Kernel Functions for Drivers              net_isvalidchecksum(9F)



NAME
     net_isvalidchecksum - verify layer 3 and layer 4  checksums

SYNOPSIS
     #include 

     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  sub-
           ject 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  attri-
     butes:



SunOS 5.11           Last change: 1 May 2008                    1






Kernel Functions for Drivers              net_isvalidchecksum(9F)



     ____________________________________________________________
    |       ATTRIBUTE TYPE        |       ATTRIBUTE VALUE       |
    |_____________________________|_____________________________|
    | Availability                | SUNWcs                      |
    |_____________________________|_____________________________|
    | Interface Stability         | Committed                   |
    |_____________________________|_____________________________|


SEE ALSO
     net_ispartialchecksum(9F),  net_protocol_lookup(9F),  attri-
     butes(5)











































SunOS 5.11           Last change: 1 May 2008                    2