if_slowtimo timeout driven

[unix-history] / usr / src / sys / net / if.c

/*      if.c    4.19    82/09/12        */

#include "../h/param.h"
#include "../h/systm.h"
#include "../h/socket.h"
#include "../h/protosw.h"
#include "../net/in.h"
#include "../net/in_systm.h"
#include "../net/if.h"
#include "../net/af.h"

int     ifqmaxlen = IFQ_MAXLEN;

/*
* Network interface utility routines.
*
* Routines with if_ifwith* names take sockaddr *'s as
* parameters.  Other routines take value parameters,
* e.g. if_ifwithnet takes the network number.
*/

ifinit()
{
       register struct ifnet *ifp;

       for (ifp = ifnet; ifp; ifp = ifp->if_next)
               if (ifp->if_init) {
                       (*ifp->if_init)(ifp->if_unit);
                       if (ifp->if_snd.ifq_maxlen == 0)
                               ifp->if_snd.ifq_maxlen = ifqmaxlen;
               }
       if_slowtimo();
}

/*
* Call each interface on a Unibus reset.
*/
ifubareset(uban)
       int uban;
{
       register struct ifnet *ifp;

       for (ifp = ifnet; ifp; ifp = ifp->if_next)
               if (ifp->if_ubareset)
                       (*ifp->if_ubareset)(uban);
}

/*
* Attach an interface to the
* list of "active" interfaces.
*/
if_attach(ifp)
       struct ifnet *ifp;
{
       register struct ifnet **p = &ifnet;

       while (*p)
               p = &((*p)->if_next);
       *p = ifp;
}

/*
* Locate an interface based on a complete address.
*/
/*ARGSUSED*/
struct ifnet *
if_ifwithaddr(addr)
       struct sockaddr *addr;
{
       register struct ifnet *ifp;

#define equal(a1, a2) \
       (bcmp((caddr_t)((a1)->sa_data), (caddr_t)((a2)->sa_data), 14) == 0)
       for (ifp = ifnet; ifp; ifp = ifp->if_next) {
               if (ifp->if_addr.sa_family != addr->sa_family)
                       continue;
               if (equal(&ifp->if_addr, addr))
                       break;
               if ((ifp->if_flags & IFF_BROADCAST) &&
                   equal(&ifp->if_broadaddr, addr))
                       break;
       }
       return (ifp);
}

/*
* Find an interface on a specific network.  If many, choice
* is first found.
*/
struct ifnet *
if_ifwithnet(addr)
       register struct sockaddr *addr;
{
       register struct ifnet *ifp;
       register int af = addr->sa_family;
       register int (*netmatch)();

       if (af >= AF_MAX)
               return (0);
       netmatch = afswitch[af].af_netmatch;
       for (ifp = ifnet; ifp; ifp = ifp->if_next) {
               if (af != ifp->if_addr.sa_family)
                       continue;
               if ((*netmatch)(addr, &ifp->if_addr))
                       break;
       }
       return (ifp);
}

/*
* As above, but parameter is network number.
*/
struct ifnet *
if_ifonnetof(net)
       register int net;
{
       register struct ifnet *ifp;

       for (ifp = ifnet; ifp; ifp = ifp->if_next)
               if (ifp->if_net == net)
                       break;
       return (ifp);
}

/*
* Find an interface using a specific address family
*/
struct ifnet *
if_ifwithaf(af)
       register int af;
{
       register struct ifnet *ifp;

       for (ifp = ifnet; ifp; ifp = ifp->if_next)
               if (ifp->if_addr.sa_family == af)
                       break;
       return (ifp);
}

/*
* Mark an interface down and notify protocols of
* the transition.
*/
if_down(ifp)
       register struct ifnet *ifp;
{

       ifp->if_flags &= ~IFF_UP;
       pfctlinput(PRC_IFDOWN, (caddr_t)&ifp->if_addr);
}

/*
* Handle interface watchdog timer routines.  Called
* from softclock, we decrement timers (if set) and
* call the appropriate interface routine on expiration.
*/
if_slowtimo()
{
       register struct ifnet *ifp;

       for (ifp = ifnet; ifp; ifp = ifp->if_next)
               if (ifp->if_timer && --ifp->if_timer == 0) {
                       if (ifp->if_watchdog == 0) {
                               printf("%s%d: no watchdog routine\n", 
                                       ifp->if_name, ifp->if_unit);
                               continue;
                       }
                       (*ifp->if_watchdog)(ifp->if_unit);
               }
       timeout(if_slowtimo, 0, hz / IFNET_SLOWHZ);
}