1 /* 2 * Copyright (c) 1982 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 6.4 (Berkeley) 06/16/85 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; 38 register struct mbuf *m; 39 int len, rlen, off, error = 0; 40 struct route idproute; 41 struct sockaddr_ns *dst; 42 extern int idpcksum; 43 44 if (ns_hold_output) { 45 if (ns_lastout) { 46 m_free(ns_lastout); 47 } 48 ns_lastout = m_copy(m0, 0, M_COPYALL); 49 } 50 if (ns_copy_output) { 51 ns_watch_output(m0); 52 } 53 54 /* 55 * Route packet. 56 */ 57 if (ro == 0) { 58 ro = &idproute; 59 bzero((caddr_t)ro, sizeof (*ro)); 60 } 61 dst = (struct sockaddr_ns *)&ro->ro_dst; 62 if (ro->ro_rt == 0) { 63 dst->sns_family = AF_NS; 64 dst->sns_addr = idp->idp_dna; 65 dst->sns_addr.x_port = 0; 66 /* 67 * If routing to interface only, 68 * short circuit routing lookup. 69 */ 70 if (flags & NS_ROUTETOIF) { 71 struct ns_ifaddr *ia; 72 ia = ns_iaonnetof(idp->idp_dna.x_net); 73 if (ia == 0) { 74 error = ENETUNREACH; 75 goto bad; 76 } 77 ifp = ia->ia_ifp; 78 goto gotif; 79 } 80 rtalloc(ro); 81 } else if ((ro->ro_rt->rt_flags & RTF_UP) == 0) { 82 /* 83 * The old route has gone away; try for a new one. 84 */ 85 rtfree(ro->ro_rt); 86 rtalloc(ro); 87 } 88 if (ro->ro_rt == 0 || (ifp = ro->ro_rt->rt_ifp) == 0) { 89 error = ENETUNREACH; 90 goto bad; 91 } 92 ro->ro_rt->rt_use++; 93 if (ro->ro_rt->rt_flags & (RTF_GATEWAY|RTF_HOST)) 94 dst = (struct sockaddr_ns *)&ro->ro_rt->rt_gateway; 95 gotif: 96 97 /* 98 * Look for multicast addresses and 99 * and verify user is allowed to send 100 * such a packet. 101 */ 102 if (dst->sns_addr.x_host.c_host[0]&1) { 103 if ((ifp->if_flags & IFF_BROADCAST) == 0) { 104 error = EADDRNOTAVAIL; 105 goto bad; 106 } 107 if ((flags & NS_ALLOWBROADCAST) == 0) { 108 error = EACCES; 109 goto bad; 110 } 111 } 112 113 if (htons(idp->idp_len) <= ifp->if_mtu) { 114 ns_output_cnt++; 115 error = (*ifp->if_output)(ifp, m0, (struct sockaddr *)dst); 116 goto done; 117 } else error = EMSGSIZE; 118 119 120 bad: 121 m_freem(m0); 122 done: 123 if (ro == &idproute && (flags & NS_ROUTETOIF) == 0 && ro->ro_rt) 124 RTFREE(ro->ro_rt); 125 return (error); 126 } 127