do it "right"?

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

/*      raw_cb.c        4.19    83/06/19        */

#include "../h/param.h"
#include "../h/systm.h"
#include "../h/mbuf.h"
#include "../h/socket.h"
#include "../h/socketvar.h"
#include "../h/errno.h"

#include "../net/if.h"
#include "../net/raw_cb.h"
#include "../netinet/in.h"
#include "../netpup/pup.h"

#include "../vax/mtpr.h"

/*
* Routines to manage the raw protocol control blocks. 
*
* TODO:
*      hash lookups by protocol family/protocol + address family
*      take care of unique address problems per AF?
*      redo address binding to allow wildcards
*/

/*
* Allocate a control block and a nominal amount
* of buffer space for the socket.
*/
raw_attach(so)
       register struct socket *so;
{
       struct mbuf *m;
       register struct rawcb *rp;

       m = m_getclr(M_DONTWAIT, MT_PCB);
       if (m == 0)
               return (ENOBUFS);
       if (sbreserve(&so->so_snd, RAWSNDQ) == 0)
               goto bad;
       if (sbreserve(&so->so_rcv, RAWRCVQ) == 0)
               goto bad2;
       rp = mtod(m, struct rawcb *);
       rp->rcb_socket = so;
       insque(rp, &rawcb);
       so->so_pcb = (caddr_t)rp;
       rp->rcb_pcb = 0;
       return (0);
bad2:
       sbrelease(&so->so_snd);
bad:
       (void) m_free(m);
       return (ENOBUFS);
}

/*
* Detach the raw connection block and discard
* socket resources.
*/
raw_detach(rp)
       register struct rawcb *rp;
{
       struct socket *so = rp->rcb_socket;

       so->so_pcb = 0;
       sofree(so);
       remque(rp);
       m_freem(dtom(rp));
}

/*
* Disconnect and possibly release resources.
*/
raw_disconnect(rp)
       struct rawcb *rp;
{

       rp->rcb_flags &= ~RAW_FADDR;
       if (rp->rcb_socket->so_state & SS_NOFDREF)
               raw_detach(rp);
}

raw_bind(so, nam)
       register struct socket *so;
       struct mbuf *nam;
{
       struct sockaddr *addr = mtod(nam, struct sockaddr *);
       register struct rawcb *rp;

       if (ifnet == 0)
               return (EADDRNOTAVAIL);
/* BEGIN DUBIOUS */
       /*
        * Should we verify address not already in use?
        * Some say yes, others no.
        */
       switch (addr->sa_family) {

#ifdef INET
       case AF_IMPLINK:
       case AF_INET: {
               if (((struct sockaddr_in *)addr)->sin_addr.s_addr &&
                   if_ifwithaddr(addr) == 0)
                       return (EADDRNOTAVAIL);
               break;
       }
#endif

#ifdef PUP
       /*
        * Curious, we convert PUP address format to internet
        * to allow us to verify we're asking for an Ethernet
        * interface.  This is wrong, but things are heavily
        * oriented towards the internet addressing scheme, and
        * converting internet to PUP would be very expensive.
        */
       case AF_PUP: {
               struct sockaddr_pup *spup = (struct sockaddr_pup *)addr;
               struct sockaddr_in inpup;

               bzero((caddr_t)&inpup, (unsigned)sizeof(inpup));
               inpup.sin_family = AF_INET;
               inpup.sin_addr.s_net = spup->spup_net;
               inpup.sin_addr.s_impno = spup->spup_host;
               if (inpup.sin_addr.s_addr &&
                   if_ifwithaddr((struct sockaddr *)&inpup) == 0)
                       return (EADDRNOTAVAIL);
               break;
       }
#endif

       default:
               return (EAFNOSUPPORT);
       }
/* END DUBIOUS */
       rp = sotorawcb(so);
       bcopy((caddr_t)addr, (caddr_t)&rp->rcb_laddr, sizeof (*addr));
       rp->rcb_flags |= RAW_LADDR;
       return (0);
}

/*
* Associate a peer's address with a
* raw connection block.
*/
raw_connaddr(rp, nam)
       struct rawcb *rp;
       struct mbuf *nam;
{
       struct sockaddr *addr = mtod(nam, struct sockaddr *);

       bcopy((caddr_t)addr, (caddr_t)&rp->rcb_faddr, sizeof(*addr));
       rp->rcb_flags |= RAW_FADDR;
}