lint

[unix-history] / usr / src / sys / netinet / in.c

/*      in.c    4.6     82/10/17        */

#include "../h/param.h"
#include "../h/mbuf.h"
#include "../h/protosw.h"
#include "../h/socket.h"
#include "../h/socketvar.h"
#include "../netinet/in.h"
#include "../netinet/in_systm.h"
#include "../net/if.h"
#include "../net/route.h"
#include "../net/af.h"

#ifdef INET
inet_hash(sin, hp)
       register struct sockaddr_in *sin;
       struct afhash *hp;
{

       hp->afh_nethash = in_netof(sin->sin_addr);
       hp->afh_hosthash = ntohl(sin->sin_addr.s_addr);
}

inet_netmatch(sin1, sin2)
       struct sockaddr_in *sin1, *sin2;
{

       return (sin1->sin_addr.s_net == sin2->sin_addr.s_net);
}

/*
* Formulate an Internet address from network + host.  Used in
* building addresses stored in the ifnet structure.
*/
struct in_addr
if_makeaddr(net, host)
       int net, host;
{
       u_long addr;

       if (net < 128)
               addr = (net << IN_CLASSANSHIFT) | host;
       else if (net < 65536)
               addr = (net << IN_CLASSBNSHIFT) | host;
       else
               addr = (net << IN_CLASSCNSHIFT) | host;
#ifdef vax || pdp11 || ns16032
       addr = htonl(addr);
#endif
       return (*(struct in_addr *)&addr);
}

/*
* Return the network number from an internet address.
*/
in_netof(in)
       struct in_addr in;
{
       register u_int i = in.s_addr;

#ifdef vax || pdp11 || ns16032
       i = ntohl(i);
#endif
       if (IN_CLASSA(i))
               return (((i)&IN_CLASSANET) >> IN_CLASSANSHIFT);
       else if (IN_CLASSB(i))
               return (((i)&IN_CLASSBNET) >> IN_CLASSBNSHIFT);
       else
               return (((i)&IN_CLASSCNET) >> IN_CLASSCNSHIFT);
}

/*
* Return the host portion of an internet address.
*/
in_lnaof(in)
       struct in_addr in;
{
       register u_int i = in.s_addr;

#ifdef vax || pdp11 || ns16032
       i = ntohl(i);
#endif
       if (IN_CLASSA(i))
               return ((i)&IN_CLASSAHOST);
       else if (IN_CLASSB(i))
               return ((i)&IN_CLASSBHOST);
       else
               return ((i)&IN_CLASSCHOST);
}

/*
* Initialize an interface's routing
* table entry according to the network.
* INTERNET SPECIFIC.
*/
if_rtinit(ifp, flags)
       register struct ifnet *ifp;
       int flags;
{
       struct sockaddr_in sin;

       if (ifp->if_flags & IFF_ROUTE)
               return;
       bzero((caddr_t)&sin, sizeof (sin));
       sin.sin_family = AF_INET;
       sin.sin_addr = if_makeaddr(ifp->if_net, 0);
       rtinit((struct sockaddr *)&sin, &ifp->if_addr, flags);
}
#endif