4.3BSD - /usr/src/sys/netns/ns_output.c

   1: /*
   2:  * Copyright (c) 1984, 1985, 1986 Regents of the University of California.
   3:  * All rights reserved.  The Berkeley software License Agreement
   4:  * specifies the terms and conditions for redistribution.
   5:  *
   6:  *	@(#)ns_output.c	7.1 (Berkeley) 6/5/86
   7:  */
   8: 
   9: #include "param.h"
  10: #include "mbuf.h"
  11: #include "errno.h"
  12: #include "socket.h"
  13: #include "socketvar.h"
  14: 
  15: #include "../net/if.h"
  16: #include "../net/route.h"
  17: 
  18: #include "ns.h"
  19: #include "ns_if.h"
  20: #include "idp.h"
  21: #include "idp_var.h"
  22: 
  23: #ifdef vax
  24: #include "../vax/mtpr.h"
  25: #endif
  26: int ns_hold_output = 0;
  27: int ns_copy_output = 0;
  28: int ns_output_cnt = 0;
  29: struct mbuf *ns_lastout;
  30: 
  31: ns_output(m0, ro, flags)
  32:     struct mbuf *m0;
  33:     struct route *ro;
  34:     int flags;
  35: {
  36:     register struct idp *idp = mtod(m0, struct idp *);
  37:     register struct ifnet *ifp = 0;
  38:     int error = 0;
  39:     struct route idproute;
  40:     struct sockaddr_ns *dst;
  41:     extern int idpcksum;
  42: 
  43:     if (ns_hold_output) {
  44:         if (ns_lastout) {
  45:             (void)m_free(ns_lastout);
  46:         }
  47:         ns_lastout = m_copy(m0, 0, (int)M_COPYALL);
  48:     }
  49:     /*
  50: 	 * Route packet.
  51: 	 */
  52:     if (ro == 0) {
  53:         ro = &idproute;
  54:         bzero((caddr_t)ro, sizeof (*ro));
  55:     }
  56:     dst = (struct sockaddr_ns *)&ro->ro_dst;
  57:     if (ro->ro_rt == 0) {
  58:         dst->sns_family = AF_NS;
  59:         dst->sns_addr = idp->idp_dna;
  60:         dst->sns_addr.x_port = 0;
  61:         /*
  62: 		 * If routing to interface only,
  63: 		 * short circuit routing lookup.
  64: 		 */
  65:         if (flags & NS_ROUTETOIF) {
  66:             struct ns_ifaddr *ia = ns_iaonnetof(&idp->idp_dna);
  67: 
  68:             if (ia == 0) {
  69:                 error = ENETUNREACH;
  70:                 goto bad;
  71:             }
  72:             ifp = ia->ia_ifp;
  73:             goto gotif;
  74:         }
  75:         rtalloc(ro);
  76:     } else if ((ro->ro_rt->rt_flags & RTF_UP) == 0) {
  77:         /*
  78: 		 * The old route has gone away; try for a new one.
  79: 		 */
  80:         rtfree(ro->ro_rt);
  81:         ro->ro_rt = NULL;
  82:         rtalloc(ro);
  83:     }
  84:     if (ro->ro_rt == 0 || (ifp = ro->ro_rt->rt_ifp) == 0) {
  85:         error = ENETUNREACH;
  86:         goto bad;
  87:     }
  88:     ro->ro_rt->rt_use++;
  89:     if (ro->ro_rt->rt_flags & (RTF_GATEWAY|RTF_HOST))
  90:         dst = (struct sockaddr_ns *)&ro->ro_rt->rt_gateway;
  91: gotif:
  92: 
  93:     /*
  94: 	 * Look for multicast addresses and
  95: 	 * and verify user is allowed to send
  96: 	 * such a packet.
  97: 	 */
  98:     if (dst->sns_addr.x_host.c_host[0]&1) {
  99:         if ((ifp->if_flags & IFF_BROADCAST) == 0) {
 100:             error = EADDRNOTAVAIL;
 101:             goto bad;
 102:         }
 103:         if ((flags & NS_ALLOWBROADCAST) == 0) {
 104:             error = EACCES;
 105:             goto bad;
 106:         }
 107:     }
 108: 
 109:     if (htons(idp->idp_len) <= ifp->if_mtu) {
 110:         ns_output_cnt++;
 111:         if (ns_copy_output) {
 112:             ns_watch_output(m0, ifp);
 113:         }
 114:         error = (*ifp->if_output)(ifp, m0, (struct sockaddr *)dst);
 115:         goto done;
 116:     } else error = EMSGSIZE;
 117: 
 118: 
 119: bad:
 120:     if (ns_copy_output) {
 121:         ns_watch_output(m0, ifp);
 122:     }
 123:     m_freem(m0);
 124: done:
 125:     if (ro == &idproute && (flags & NS_ROUTETOIF) == 0 && ro->ro_rt)
 126:         RTFREE(ro->ro_rt);
 127:     return (error);
 128: }

Defined functions

Defined variables