The code in tcp_input() to disallow a socket from connecting to itself

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

/*
* Copyright (c) 1980, 1986, 1993
*      The Regents of the University of California.  All rights reserved.
*
* %sccs.include.redist.c%
*
*      @(#)raw_cb.c    8.1 (Berkeley) %G%
*/

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/domain.h>
#include <sys/protosw.h>
#include <sys/errno.h>

#include <net/if.h>
#include <net/route.h>
#include <net/raw_cb.h>
#include <netinet/in.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
*/

u_long  raw_sendspace = RAWSNDQ;
u_long  raw_recvspace = RAWRCVQ;

/*
* Allocate a control block and a nominal amount
* of buffer space for the socket.
*/
int
raw_attach(so, proto)
       register struct socket *so;
       int proto;
{
       register struct rawcb *rp = sotorawcb(so);
       int error;

       /*
        * It is assumed that raw_attach is called
        * after space has been allocated for the
        * rawcb.
        */
       if (rp == 0)
               return (ENOBUFS);
       if (error = soreserve(so, raw_sendspace, raw_recvspace))
               return (error);
       rp->rcb_socket = so;
       rp->rcb_proto.sp_family = so->so_proto->pr_domain->dom_family;
       rp->rcb_proto.sp_protocol = proto;
       insque(rp, &rawcb);
       return (0);
}

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

       so->so_pcb = 0;
       sofree(so);
       remque(rp);
#ifdef notdef
       if (rp->rcb_laddr)
               m_freem(dtom(rp->rcb_laddr));
       rp->rcb_laddr = 0;
#endif
       free((caddr_t)(rp), M_PCB);
}

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

#ifdef notdef
       if (rp->rcb_faddr)
               m_freem(dtom(rp->rcb_faddr));
       rp->rcb_faddr = 0;
#endif
       if (rp->rcb_socket->so_state & SS_NOFDREF)
               raw_detach(rp);
}

#ifdef notdef
int
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);
       rp = sotorawcb(so);
       nam = m_copym(nam, 0, M_COPYALL, M_WAITOK);
       rp->rcb_laddr = mtod(nam, struct sockaddr *);
       return (0);
}
#endif