1 /* $OpenBSD: if_enc.c,v 1.47 2007/12/20 02:53:02 brad Exp $ */ 2 /* 3 * The authors of this code are John Ioannidis (ji@tla.org), 4 * Angelos D. Keromytis (kermit@csd.uch.gr) and 5 * Niels Provos (provos@physnet.uni-hamburg.de). 6 * 7 * This code was written by John Ioannidis for BSD/OS in Athens, Greece, 8 * in November 1995. 9 * 10 * Ported to OpenBSD and NetBSD, with additional transforms, in December 1996, 11 * by Angelos D. Keromytis. 12 * 13 * Additional transforms and features in 1997 and 1998 by Angelos D. Keromytis 14 * and Niels Provos. 15 * 16 * Copyright (C) 1995, 1996, 1997, 1998 by John Ioannidis, Angelos D. Keromytis 17 * and Niels Provos. 18 * Copyright (c) 2001, Angelos D. Keromytis. 19 * 20 * Permission to use, copy, and modify this software with or without fee 21 * is hereby granted, provided that this entire notice is included in 22 * all copies of any software which is or includes a copy or 23 * modification of this software. 24 * You may use this code under the GNU public license if you so wish. Please 25 * contribute changes back to the authors under this freer than GPL license 26 * so that we may further the use of strong encryption without limitations to 27 * all. 28 * 29 * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR 30 * IMPLIED WARRANTY. IN PARTICULAR, NONE OF THE AUTHORS MAKES ANY 31 * REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE 32 * MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR 33 * PURPOSE. 34 */ 35 36 /* 37 * Encapsulation interface driver. 38 */ 39 40 #include <sys/param.h> 41 #include <sys/systm.h> 42 #include <sys/mbuf.h> 43 #include <sys/socket.h> 44 #include <sys/ioctl.h> 45 46 #include <net/if.h> 47 #include <net/if_types.h> 48 #include <net/route.h> 49 #include <net/bpf.h> 50 51 #include <net/if_enc.h> 52 53 #ifdef INET 54 #include <netinet/in.h> 55 #include <netinet/in_var.h> 56 #endif 57 58 #ifdef INET6 59 #ifndef INET 60 #include <netinet/in.h> 61 #endif 62 #include <netinet6/nd6.h> 63 #endif /* INET6 */ 64 65 #include "bpfilter.h" 66 #include "enc.h" 67 68 #ifdef ENCDEBUG 69 #define DPRINTF(x) do { if (encdebug) printf x ; } while (0) 70 #else 71 #define DPRINTF(x) 72 #endif 73 74 struct enc_softc encif[NENC]; 75 76 void encattach(int); 77 int encoutput(struct ifnet *, struct mbuf *, struct sockaddr *, 78 struct rtentry *); 79 int encioctl(struct ifnet *, u_long, caddr_t); 80 void encstart(struct ifnet *); 81 82 void 83 encattach(int nenc) 84 { 85 struct ifnet *ifp; 86 int i; 87 88 bzero(encif, sizeof(encif)); 89 90 for (i = 0; i < NENC; i++) { 91 ifp = &encif[i].sc_if; 92 snprintf(ifp->if_xname, sizeof ifp->if_xname, "enc%d", i); 93 ifp->if_softc = &encif[i]; 94 ifp->if_mtu = ENCMTU; 95 ifp->if_ioctl = encioctl; 96 ifp->if_output = encoutput; 97 ifp->if_start = encstart; 98 ifp->if_type = IFT_ENC; 99 ifp->if_snd.ifq_maxlen = ifqmaxlen; 100 ifp->if_hdrlen = ENC_HDRLEN; 101 if_attach(ifp); 102 if_alloc_sadl(ifp); 103 104 #if NBPFILTER > 0 105 bpfattach(&encif[i].sc_if.if_bpf, ifp, DLT_ENC, ENC_HDRLEN); 106 #endif 107 } 108 } 109 110 /* 111 * Start output on the enc interface. 112 */ 113 void 114 encstart(struct ifnet *ifp) 115 { 116 struct mbuf *m; 117 int s; 118 119 for (;;) { 120 s = splnet(); 121 IF_DROP(&ifp->if_snd); 122 IF_DEQUEUE(&ifp->if_snd, m); 123 splx(s); 124 125 if (m == NULL) 126 return; 127 else 128 m_freem(m); 129 } 130 } 131 132 int 133 encoutput(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst, 134 struct rtentry *rt) 135 { 136 m_freem(m); 137 return (0); 138 } 139 140 /* ARGSUSED */ 141 int 142 encioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 143 { 144 switch (cmd) { 145 case SIOCSIFADDR: 146 case SIOCAIFADDR: 147 case SIOCSIFDSTADDR: 148 case SIOCSIFFLAGS: 149 if (ifp->if_flags & IFF_UP) 150 ifp->if_flags |= IFF_RUNNING; 151 else 152 ifp->if_flags &= ~IFF_RUNNING; 153 break; 154 default: 155 return (ENOTTY); 156 } 157 158 return 0; 159 } 160