Skip to content
This repository

HTTPS clone URL

Subversion checkout URL

You can clone with HTTPS or Subversion.

Download ZIP
branch: trunk
Fetching contributors…

Cannot retrieve contributors at this time

file 296 lines (254 sloc) 6.776 kb
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296
/* $NetBSD: if_faith.c,v 1.49 2014/06/06 01:02:47 rmind Exp $ */
/* $KAME: if_faith.c,v 1.21 2001/02/20 07:59:26 itojun Exp $ */

/*
* Copyright (c) 1982, 1986, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* derived from
* @(#)if_loop.c 8.1 (Berkeley) 6/10/93
* Id: if_loop.c,v 1.22 1996/06/19 16:24:10 wollman Exp
*/

/*
* IPv6-to-IPv4 TCP relay capturing interface
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: if_faith.c,v 1.49 2014/06/06 01:02:47 rmind Exp $");

#include "opt_inet.h"

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/errno.h>
#include <sys/ioctl.h>
#include <sys/time.h>
#include <sys/queue.h>

#include <sys/cpu.h>

#include <net/if.h>
#include <net/if_types.h>
#include <net/netisr.h>
#include <net/route.h>
#include <net/bpf.h>
#include <net/if_faith.h>

#ifdef INET
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/in_var.h>
#include <netinet/ip.h>
#endif

#ifdef INET6
#ifndef INET
#include <netinet/in.h>
#endif
#include <netinet6/in6_var.h>
#include <netinet/ip6.h>
#include <netinet6/ip6_var.h>
#endif


#include <net/net_osdep.h>

static int faithioctl(struct ifnet *, u_long, void *);
static int faithoutput(struct ifnet *, struct mbuf *,
const struct sockaddr *, struct rtentry *);
static void faithrtrequest(int, struct rtentry *,
const struct rt_addrinfo *);

void faithattach(int);

static int faith_clone_create(struct if_clone *, int);
static int faith_clone_destroy(struct ifnet *);

static struct if_clone faith_cloner =
    IF_CLONE_INITIALIZER("faith", faith_clone_create, faith_clone_destroy);

#define FAITHMTU 1500

/* ARGSUSED */
void
faithattach(int count)
{

if_clone_attach(&faith_cloner);
}

static int
faith_clone_create(struct if_clone *ifc, int unit)
{
struct ifnet *ifp;

ifp = if_alloc(IFT_FAITH);

if_initname(ifp, ifc->ifc_name, unit);

ifp->if_mtu = FAITHMTU;
/* Change to BROADCAST experimentaly to announce its prefix. */
ifp->if_flags = /* IFF_LOOPBACK */ IFF_BROADCAST | IFF_MULTICAST;
ifp->if_ioctl = faithioctl;
ifp->if_output = faithoutput;
ifp->if_type = IFT_FAITH;
ifp->if_hdrlen = 0;
ifp->if_addrlen = 0;
ifp->if_dlt = DLT_NULL;
if_attach(ifp);
if_alloc_sadl(ifp);
bpf_attach(ifp, DLT_NULL, sizeof(u_int));
return (0);
}

int
faith_clone_destroy(struct ifnet *ifp)
{

bpf_detach(ifp);
if_detach(ifp);
free(ifp, M_DEVBUF);

return (0);
}

static int
faithoutput(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst,
    struct rtentry *rt)
{
pktqueue_t *pktq;
size_t pktlen;
int s, error;
uint32_t af;

if ((m->m_flags & M_PKTHDR) == 0)
panic("faithoutput no HDR");
af = dst->sa_family;
/* BPF write needs to be handled specially */
if (af == AF_UNSPEC) {
af = *(mtod(m, int *));
m_adj(m, sizeof(int));
}

bpf_mtap_af(ifp, af, m);

if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) {
m_freem(m);
return (rt->rt_flags & RTF_BLACKHOLE ? 0 :
rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH);
}
pktlen = m->m_pkthdr.len;
ifp->if_opackets++;
ifp->if_obytes += pktlen;
switch (af) {
#ifdef INET
case AF_INET:
pktq = ip_pktq;
break;
#endif
#ifdef INET6
case AF_INET6:
pktq = ip6_pktq;
break;
#endif
default:
m_freem(m);
return EAFNOSUPPORT;
}

/* XXX do we need more sanity checks? */
KASSERT(pktq != NULL);
m->m_pkthdr.rcvif = ifp;

s = splnet();
if (__predict_true(pktq_enqueue(pktq, m, 0))) {
ifp->if_ipackets++;
ifp->if_ibytes += pktlen;
error = 0;
} else {
m_freem(m);
error = ENOBUFS;
}
splx(s);

return error;
}

/* ARGSUSED */
static void
faithrtrequest(int cmd, struct rtentry *rt,
    const struct rt_addrinfo *info)
{
if (rt)
rt->rt_rmx.rmx_mtu = rt->rt_ifp->if_mtu; /* for ISO */
}

/*
* Process an ioctl request.
*/
/* ARGSUSED */
static int
faithioctl(struct ifnet *ifp, u_long cmd, void *data)
{
struct ifaddr *ifa;
struct ifreq *ifr = (struct ifreq *)data;
int error = 0;

switch (cmd) {

case SIOCINITIFADDR:
ifp->if_flags |= IFF_UP | IFF_RUNNING;
ifa = (struct ifaddr *)data;
ifa->ifa_rtrequest = faithrtrequest;
/*
* Everything else is done at a higher level.
*/
break;

case SIOCADDMULTI:
case SIOCDELMULTI:
if (ifr == 0) {
error = EAFNOSUPPORT; /* XXX */
break;
}
switch (ifr->ifr_addr.sa_family) {
#ifdef INET
case AF_INET:
break;
#endif
#ifdef INET6
case AF_INET6:
break;
#endif

default:
error = EAFNOSUPPORT;
break;
}
break;

default:
if ((error = ifioctl_common(ifp, cmd, data)) == ENETRESET)
error = 0;
break;
}
return (error);
}

#ifdef INET6
/*
* XXX could be slow
* XXX could be layer violation to call sys/net from sys/netinet6
*/
int
faithprefix(struct in6_addr *in6)
{
struct rtentry *rt;
struct sockaddr_in6 sin6;
int ret;

if (ip6_keepfaith == 0)
return 0;

memset(&sin6, 0, sizeof(sin6));
sin6.sin6_family = AF_INET6;
sin6.sin6_len = sizeof(struct sockaddr_in6);
sin6.sin6_addr = *in6;
rt = rtalloc1((struct sockaddr *)&sin6, 0);
if (rt && rt->rt_ifp && rt->rt_ifp->if_type == IFT_FAITH &&
(rt->rt_ifp->if_flags & IFF_UP) != 0)
ret = 1;
else
ret = 0;
if (rt)
rtfree(rt);
return ret;
}
#endif
Something went wrong with that request. Please try again.