Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/netns/ns_output.c
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1 /* $NetBSD: ns_output.c,v 1.12 2003/08/07 16:33:46 agc Exp $ */ 2 3 /* 4 * Copyright (c) 1984, 1985, 1986, 1987, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * @(#)ns_output.c 8.1 (Berkeley) 6/10/93 32 */ 33 34 #include <sys/cdefs.h> 35 __KERNEL_RCSID(0, "$NetBSD: ns_output.c,v 1.12 2003/08/07 16:33:46 agc Exp $"); 36 37 #include <sys/param.h> 38 #include <sys/systm.h> 39 #include <sys/malloc.h> 40 #include <sys/mbuf.h> 41 #include <sys/errno.h> 42 #include <sys/socket.h> 43 #include <sys/socketvar.h> 44 45 #include <net/if.h> 46 #include <net/route.h> 47 48 #include <netns/ns.h> 49 #include <netns/ns_if.h> 50 #include <netns/ns_var.h> 51 #include <netns/idp.h> 52 #include <netns/idp_var.h> 53 54 #include <machine/stdarg.h> 55 56 int ns_hold_output = 0; 57 int ns_copy_output = 0; 58 int ns_output_cnt = 0; 59 struct mbuf *ns_lastout; 60 61 int 62 #if __STDC__ 63 ns_output(struct mbuf *m0, ...) 64 #else 65 ns_output(m0, va_alist) 66 struct mbuf *m0; 67 va_dcl 68 #endif 69 { 70 struct route *ro; 71 int flags; 72 struct idp *idp = mtod(m0, struct idp *); 73 struct ifnet *ifp = 0; 74 int error = 0; 75 struct route idproute; 76 struct sockaddr_ns *dst; 77 va_list ap; 78 79 va_start(ap, m0); 80 ro = va_arg(ap, struct route *); 81 flags = va_arg(ap, int); 82 va_end(ap); 83 84 if (ns_hold_output) { 85 if (ns_lastout) { 86 (void)m_free(ns_lastout); 87 } 88 ns_lastout = m_copy(m0, 0, (int)M_COPYALL); 89 } 90 /* 91 * Route packet. 92 */ 93 if (ro == 0) { 94 ro = &idproute; 95 bzero((caddr_t)ro, sizeof (*ro)); 96 } 97 dst = satosns(&ro->ro_dst); 98 if (ro->ro_rt == 0) { 99 dst->sns_family = AF_NS; 100 dst->sns_len = sizeof (*dst); 101 dst->sns_addr = idp->idp_dna; 102 dst->sns_addr.x_port = 0; 103 /* 104 * If routing to interface only, 105 * short circuit routing lookup. 106 */ 107 if (flags & NS_ROUTETOIF) { 108 struct ns_ifaddr *ia = ns_iaonnetof(&idp->idp_dna); 109 110 if (ia == 0) { 111 error = ENETUNREACH; 112 goto bad; 113 } 114 ifp = ia->ia_ifp; 115 goto gotif; 116 } 117 rtalloc(ro); 118 } else if ((ro->ro_rt->rt_flags & RTF_UP) == 0) { 119 /* 120 * The old route has gone away; try for a new one. 121 */ 122 rtfree(ro->ro_rt); 123 ro->ro_rt = NULL; 124 rtalloc(ro); 125 } 126 if (ro->ro_rt == 0 || (ifp = ro->ro_rt->rt_ifp) == 0) { 127 error = ENETUNREACH; 128 goto bad; 129 } 130 ro->ro_rt->rt_use++; 131 if (ro->ro_rt->rt_flags & (RTF_GATEWAY|RTF_HOST)) 132 dst = satosns(ro->ro_rt->rt_gateway); 133 gotif: 134 135 /* 136 * Look for multicast addresses and 137 * and verify user is allowed to send 138 * such a packet. 139 */ 140 if (dst->sns_addr.x_host.c_host[0]&1) { 141 if ((ifp->if_flags & IFF_BROADCAST) == 0) { 142 error = EADDRNOTAVAIL; 143 goto bad; 144 } 145 if ((flags & NS_ALLOWBROADCAST) == 0) { 146 error = EACCES; 147 goto bad; 148 } 149 } 150 151 if (ntohs(idp->idp_len) <= ifp->if_mtu) { 152 ns_output_cnt++; 153 if (ns_copy_output) { 154 ns_watch_output(m0, ifp); 155 } 156 error = (*ifp->if_output)(ifp, m0, snstosa(dst), ro->ro_rt); 157 goto done; 158 } else error = EMSGSIZE; 159 160 161 bad: 162 if (ns_copy_output) { 163 ns_watch_output(m0, ifp); 164 } 165 m_freem(m0); 166 done: 167 if (ro == &idproute && (flags & NS_ROUTETOIF) == 0 && ro->ro_rt) { 168 RTFREE(ro->ro_rt); 169 ro->ro_rt = 0; 170 } 171 return (error); 172 }
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