2.11BSD#431 - /usr/src/sys/netns/ns_output.c

   1: /*
   2:  * Copyright (c) 1984, 1985, 1986, 1987 Regents of the University of California.
   3:  * All rights reserved.
   4:  *
   5:  * Redistribution and use in source and binary forms are permitted
   6:  * provided that this notice is preserved and that due credit is given
   7:  * to the University of California at Berkeley. The name of the University
   8:  * may not be used to endorse or promote products derived from this
   9:  * software without specific prior written permission. This software
  10:  * is provided ``as is'' without express or implied warranty.
  11:  *
  12:  *      @(#)ns_output.c	7.2 (Berkeley) 1/20/88
  13:  */
  14: 
  15: #include "param.h"
  16: #ifdef  NS
  17: #include "mbuf.h"
  18: #include "errno.h"
  19: #include "socket.h"
  20: #include "socketvar.h"
  21: 
  22: #include "../net/if.h"
  23: #include "../net/route.h"
  24: 
  25: #include "ns.h"
  26: #include "ns_if.h"
  27: #include "idp.h"
  28: #include "idp_var.h"
  29: 
  30: #ifdef vax
  31: #include "../vax/mtpr.h"
  32: #endif
  33: int ns_hold_output = 0;
  34: int ns_copy_output = 0;
  35: int ns_output_cnt = 0;
  36: struct mbuf *ns_lastout;
  37: 
  38: ns_output(m0, ro, flags)
  39:     struct mbuf *m0;
  40:     struct route *ro;
  41:     int flags;
  42: {
  43:     register struct idp *idp = mtod(m0, struct idp *);
  44:     register struct ifnet *ifp = 0;
  45:     int error = 0;
  46:     struct route idproute;
  47:     struct sockaddr_ns *dst;
  48:     extern int idpcksum;
  49: 
  50:     if (ns_hold_output) {
  51:         if (ns_lastout) {
  52:             (void)m_free(ns_lastout);
  53:         }
  54:         ns_lastout = m_copy(m0, 0, (int)M_COPYALL);
  55:     }
  56:     /*
  57: 	 * Route packet.
  58: 	 */
  59:     if (ro == 0) {
  60:         ro = &idproute;
  61:         bzero((caddr_t)ro, sizeof (*ro));
  62:     }
  63:     dst = (struct sockaddr_ns *)&ro->ro_dst;
  64:     if (ro->ro_rt == 0) {
  65:         dst->sns_family = AF_NS;
  66:         dst->sns_addr = idp->idp_dna;
  67:         dst->sns_addr.x_port = 0;
  68:         /*
  69: 		 * If routing to interface only,
  70: 		 * short circuit routing lookup.
  71: 		 */
  72:         if (flags & NS_ROUTETOIF) {
  73:             struct ns_ifaddr *ia = ns_iaonnetof(&idp->idp_dna);
  74: 
  75:             if (ia == 0) {
  76:                 error = ENETUNREACH;
  77:                 goto bad;
  78:             }
  79:             ifp = ia->ia_ifp;
  80:             goto gotif;
  81:         }
  82:         rtalloc(ro);
  83:     } else if ((ro->ro_rt->rt_flags & RTF_UP) == 0) {
  84:         /*
  85: 		 * The old route has gone away; try for a new one.
  86: 		 */
  87:         rtfree(ro->ro_rt);
  88:         ro->ro_rt = NULL;
  89:         rtalloc(ro);
  90:     }
  91:     if (ro->ro_rt == 0 || (ifp = ro->ro_rt->rt_ifp) == 0) {
  92:         error = ENETUNREACH;
  93:         goto bad;
  94:     }
  95:     ro->ro_rt->rt_use++;
  96:     if (ro->ro_rt->rt_flags & (RTF_GATEWAY|RTF_HOST))
  97:         dst = (struct sockaddr_ns *)&ro->ro_rt->rt_gateway;
  98: gotif:
  99: 
 100:     /*
 101: 	 * Look for multicast addresses and
 102: 	 * and verify user is allowed to send
 103: 	 * such a packet.
 104: 	 */
 105:     if (dst->sns_addr.x_host.c_host[0]&1) {
 106:         if ((ifp->if_flags & IFF_BROADCAST) == 0) {
 107:             error = EADDRNOTAVAIL;
 108:             goto bad;
 109:         }
 110:         if ((flags & NS_ALLOWBROADCAST) == 0) {
 111:             error = EACCES;
 112:             goto bad;
 113:         }
 114:     }
 115: 
 116:     if (htons(idp->idp_len) <= ifp->if_mtu) {
 117:         ns_output_cnt++;
 118:         if (ns_copy_output) {
 119:             ns_watch_output(m0, ifp);
 120:         }
 121:         error = (*ifp->if_output)(ifp, m0, (struct sockaddr *)dst);
 122:         goto done;
 123:     } else error = EMSGSIZE;
 124: 
 125: 
 126: bad:
 127:     if (ns_copy_output) {
 128:         ns_watch_output(m0, ifp);
 129:     }
 130:     m_freem(m0);
 131: done:
 132:     if (ro == &idproute && (flags & NS_ROUTETOIF) == 0 && ro->ro_rt)
 133:         RTFREE(ro->ro_rt);
 134:     return (error);
 135: }
 136: #endif

Defined functions

Defined variables