549 lines
12 KiB
C
549 lines
12 KiB
C
/* $NetBSD: if_srt.c,v 1.26 2017/02/14 03:05:06 ozaki-r Exp $ */
|
|
/* This file is in the public domain. */
|
|
|
|
#include <sys/cdefs.h>
|
|
__KERNEL_RCSID(0, "$NetBSD: if_srt.c,v 1.26 2017/02/14 03:05:06 ozaki-r Exp $");
|
|
|
|
#ifdef _KERNEL_OPT
|
|
#include "opt_inet.h"
|
|
#endif
|
|
|
|
#if !defined(INET) && !defined(INET6)
|
|
#error "srt without INET/INET6?"
|
|
#endif
|
|
|
|
#ifndef SRT_MAXUNIT
|
|
#define SRT_MAXUNIT 255
|
|
#endif
|
|
|
|
/* include-file bug workarounds */
|
|
#include <sys/types.h> /* sys/conf.h */
|
|
#include <sys/resource.h> /* sys/resourcevar.h
|
|
* (uvm/uvm_param.h, sys/mbuf.h)
|
|
*/
|
|
#include <netinet/in.h> /* netinet/ip.h */
|
|
#include <sys/param.h> /* sys/mbuf.h */
|
|
#include <netinet/in_systm.h> /* netinet/ip.h */
|
|
|
|
#include <sys/conf.h>
|
|
#include <sys/mbuf.h>
|
|
#include <sys/errno.h>
|
|
#include <sys/fcntl.h>
|
|
#include <sys/param.h>
|
|
#include <sys/ioctl.h>
|
|
#include <sys/module.h>
|
|
#include <sys/device.h>
|
|
#include <netinet/ip.h>
|
|
#include <netinet/ip6.h>
|
|
#include <netinet6/in6_var.h>
|
|
#include <netinet6/ip6_var.h>
|
|
#include <netinet6/nd6.h>
|
|
#include <netinet6/scope6_var.h>
|
|
#include <net/if_types.h>
|
|
|
|
#include "if_srt.h"
|
|
|
|
/* until we know what to pass to bpfattach.... */
|
|
/* #define BPFILTER_NOW_AVAILABLE */
|
|
|
|
struct srt_softc {
|
|
struct ifnet intf; /* XXX interface botch */
|
|
int unit;
|
|
int nrt;
|
|
struct srt_rt **rts;
|
|
unsigned int flags; /* SSF_* values from if_srt.h */
|
|
#define SSF_UCHG (SSF_MTULOCK) /* userland-changeable bits */
|
|
unsigned int kflags; /* bits private to this file */
|
|
#define SKF_CDEVOPEN 0x00000001
|
|
};
|
|
|
|
#include "ioconf.h"
|
|
|
|
static struct srt_softc *softcv[SRT_MAXUNIT+1];
|
|
static unsigned int global_flags;
|
|
|
|
static u_int srt_count;
|
|
|
|
/* Internal routines. */
|
|
|
|
static unsigned int ipv4_masks[33] = {
|
|
0x00000000, /* /0 */
|
|
0x80000000, 0xc0000000, 0xe0000000, 0xf0000000, /* /1 - /4 */
|
|
0xf8000000, 0xfc000000, 0xfe000000, 0xff000000, /* /5 - /8 */
|
|
0xff800000, 0xffc00000, 0xffe00000, 0xfff00000, /* /9 - /12 */
|
|
0xfff80000, 0xfffc0000, 0xfffe0000, 0xffff0000, /* /13 - /16 */
|
|
0xffff8000, 0xffffc000, 0xffffe000, 0xfffff000, /* /17 - /20 */
|
|
0xfffff800, 0xfffffc00, 0xfffffe00, 0xffffff00, /* /21 - /24 */
|
|
0xffffff80, 0xffffffc0, 0xffffffe0, 0xfffffff0, /* /25 - /28 */
|
|
0xfffffff8, 0xfffffffc, 0xfffffffe, 0xffffffff /* /29 - /32 */
|
|
};
|
|
|
|
static void
|
|
update_mtu(struct srt_softc *sc)
|
|
{
|
|
int mtu;
|
|
int i;
|
|
struct srt_rt *r;
|
|
|
|
if (sc->flags & SSF_MTULOCK)
|
|
return;
|
|
mtu = 65535;
|
|
for (i=sc->nrt-1;i>=0;i--) {
|
|
r = sc->rts[i];
|
|
if (r->u.dstifp->if_mtu < mtu)
|
|
mtu = r->u.dstifp->if_mtu;
|
|
}
|
|
sc->intf.if_mtu = mtu;
|
|
}
|
|
|
|
static struct srt_rt *
|
|
find_rt(struct srt_softc *sc, int af, ...)
|
|
{
|
|
int i;
|
|
struct srt_rt *r;
|
|
struct in_addr ia;
|
|
struct in6_addr ia6;
|
|
va_list ap;
|
|
|
|
ia.s_addr = 0; ia6.s6_addr[0] = 0; /* shut up incorrect -Wuninitialized */
|
|
va_start(ap,af);
|
|
switch (af) {
|
|
case AF_INET:
|
|
ia = va_arg(ap,struct in_addr);
|
|
break;
|
|
case AF_INET6:
|
|
ia6 = va_arg(ap,struct in6_addr);
|
|
break;
|
|
default:
|
|
panic("if_srt find_rt: impossible address family");
|
|
break;
|
|
}
|
|
va_end(ap);
|
|
for (i=0; i < sc->nrt; i++) {
|
|
r = sc->rts[i];
|
|
if (r->af != af)
|
|
continue;
|
|
switch (af) {
|
|
case AF_INET:
|
|
if ((ia.s_addr & htonl(ipv4_masks[r->srcmask])) ==
|
|
r->srcmatch.v4.s_addr)
|
|
return r;
|
|
break;
|
|
case AF_INET6:
|
|
if ((r->srcmask >= 8) &&
|
|
memcmp(&ia6,&r->srcmatch.v6,r->srcmask / 8) != 0)
|
|
continue;
|
|
if ((r->srcmask % 8) &&
|
|
((ia6.s6_addr[r->srcmask / 8] ^
|
|
r->srcmatch.v6.s6_addr[r->srcmask / 8]) &
|
|
0xff & (0xff00 >> (r->srcmask % 8))))
|
|
continue;
|
|
return r;
|
|
default:
|
|
panic("if_srt find_rt: impossible address family 2");
|
|
break;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* Network device interface. */
|
|
|
|
static int
|
|
srt_if_ioctl(struct ifnet *ifp, u_long cmd, void *data)
|
|
{
|
|
struct ifaddr *ifa;
|
|
int s;
|
|
int err;
|
|
|
|
err = 0;
|
|
s = splnet();
|
|
switch (cmd) {
|
|
case SIOCINITIFADDR:
|
|
ifa = (void *) data;
|
|
switch (ifa->ifa_addr->sa_family) {
|
|
#ifdef INET
|
|
case AF_INET:
|
|
break;
|
|
#endif
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
break;
|
|
#endif
|
|
default:
|
|
err = EAFNOSUPPORT;
|
|
break;
|
|
}
|
|
break;
|
|
default:
|
|
if ((err = ifioctl_common(ifp, cmd, data)) == ENETRESET)
|
|
err = 0;
|
|
break;
|
|
}
|
|
splx(s);
|
|
return err;
|
|
}
|
|
|
|
static int
|
|
srt_if_output(
|
|
struct ifnet *ifp,
|
|
struct mbuf *m,
|
|
const struct sockaddr *to,
|
|
const struct rtentry *rtp)
|
|
{
|
|
struct srt_softc *sc;
|
|
struct srt_rt *r;
|
|
|
|
sc = ifp->if_softc;
|
|
if (! (ifp->if_flags & IFF_UP)) {
|
|
m_freem(m);
|
|
return ENETDOWN;
|
|
}
|
|
switch (to->sa_family) {
|
|
#ifdef INET
|
|
case AF_INET: {
|
|
struct ip *ip;
|
|
ip = mtod(m,struct ip *);
|
|
r = find_rt(sc,AF_INET,ip->ip_src);
|
|
break;
|
|
}
|
|
#endif
|
|
#ifdef INET6
|
|
case AF_INET6: {
|
|
struct ip6_hdr *ip;
|
|
ip = mtod(m,struct ip6_hdr *);
|
|
r = find_rt(sc,AF_INET6,ip->ip6_src);
|
|
break;
|
|
}
|
|
#endif
|
|
default:
|
|
IF_DROP(&ifp->if_snd);
|
|
m_freem(m);
|
|
return EAFNOSUPPORT;
|
|
}
|
|
/* XXX Do we need to bpf_tap? Or do higher layers now handle that? */
|
|
/* if_gif.c seems to imply the latter. */
|
|
ifp->if_opackets ++;
|
|
if (! r) {
|
|
ifp->if_oerrors ++;
|
|
m_freem(m);
|
|
return 0;
|
|
}
|
|
if (! (m->m_flags & M_PKTHDR)) {
|
|
printf("srt_if_output no PKTHDR\n");
|
|
m_freem(m);
|
|
return 0;
|
|
}
|
|
ifp->if_obytes += m->m_pkthdr.len;
|
|
if (! (r->u.dstifp->if_flags & IFF_UP)) {
|
|
m_freem(m);
|
|
return 0; /* XXX ENETDOWN? */
|
|
}
|
|
/* XXX is 0 the right last arg here? */
|
|
if (to->sa_family == AF_INET6)
|
|
return ip6_if_output(r->u.dstifp, r->u.dstifp, m, &r->dst.sin6, 0);
|
|
return if_output_lock(r->u.dstifp, r->u.dstifp, m, &r->dst.sa, 0);
|
|
}
|
|
|
|
static int
|
|
srt_clone_create(struct if_clone *cl, int unit)
|
|
{
|
|
struct srt_softc *sc;
|
|
|
|
if (unit < 0 || unit > SRT_MAXUNIT)
|
|
return ENXIO;
|
|
if (softcv[unit])
|
|
return EBUSY;
|
|
sc = malloc(sizeof(struct srt_softc), M_DEVBUF, M_WAITOK|M_ZERO);
|
|
sc->unit = unit;
|
|
sc->nrt = 0;
|
|
sc->rts = 0;
|
|
sc->flags = 0;
|
|
sc->kflags = 0;
|
|
if_initname(&sc->intf,cl->ifc_name,unit);
|
|
sc->intf.if_softc = sc;
|
|
sc->intf.if_mtu = 65535;
|
|
sc->intf.if_flags = IFF_POINTOPOINT;
|
|
sc->intf.if_type = IFT_OTHER;
|
|
sc->intf.if_ioctl = &srt_if_ioctl;
|
|
sc->intf.if_output = &srt_if_output;
|
|
sc->intf.if_dlt = DLT_RAW;
|
|
if_attach(&sc->intf);
|
|
if_alloc_sadl(&sc->intf);
|
|
#ifdef BPFILTER_NOW_AVAILABLE
|
|
bpf_attach(&sc->intf, 0, 0);
|
|
#endif
|
|
softcv[unit] = sc;
|
|
atomic_inc_uint(&srt_count);
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
srt_clone_destroy(struct ifnet *ifp)
|
|
{
|
|
struct srt_softc *sc;
|
|
|
|
sc = ifp->if_softc;
|
|
if ((ifp->if_flags & IFF_UP) || (sc->kflags & SKF_CDEVOPEN))
|
|
return EBUSY;
|
|
#ifdef BPFILTER_NOW_AVAILABLE
|
|
bpf_detach(ifp);
|
|
#endif
|
|
if_detach(ifp);
|
|
if (sc->unit < 0 || sc->unit > SRT_MAXUNIT) {
|
|
panic("srt_clone_destroy: impossible unit %d\n",sc->unit);
|
|
}
|
|
if (softcv[sc->unit] != sc) {
|
|
panic("srt_clone_destroy: bad backpointer ([%d]=%p not %p)\n",
|
|
sc->unit,(void *)softcv[sc->unit],(void *)sc);
|
|
}
|
|
softcv[sc->unit] = 0;
|
|
free(sc,M_DEVBUF);
|
|
atomic_inc_uint(&srt_count);
|
|
return 0;
|
|
}
|
|
|
|
struct if_clone srt_clone =
|
|
IF_CLONE_INITIALIZER("srt",&srt_clone_create,&srt_clone_destroy);
|
|
|
|
void
|
|
srtattach(int n)
|
|
{
|
|
|
|
/*
|
|
* Nothing to do here, initialization is handled by the
|
|
* module initialization code in srtinit() below).
|
|
*/
|
|
}
|
|
|
|
static void
|
|
srtinit(void)
|
|
{
|
|
int i;
|
|
|
|
for (i = SRT_MAXUNIT; i >= 0; i--)
|
|
softcv[i] = 0;
|
|
global_flags = 0;
|
|
if_clone_attach(&srt_clone);
|
|
}
|
|
|
|
static int
|
|
srtdetach(void)
|
|
{
|
|
int error = 0;
|
|
int i;
|
|
|
|
for (i = SRT_MAXUNIT; i >= 0; i--)
|
|
if(softcv[i]) {
|
|
error = EBUSY;
|
|
break;
|
|
}
|
|
|
|
if (error == 0)
|
|
if_clone_detach(&srt_clone);
|
|
|
|
return error;
|
|
}
|
|
|
|
/* Special-device interface. */
|
|
|
|
static int
|
|
srt_open(dev_t dev, int flag, int mode, struct lwp *l)
|
|
{
|
|
int unit;
|
|
struct srt_softc *sc;
|
|
|
|
unit = minor(dev);
|
|
if (unit < 0 || unit > SRT_MAXUNIT)
|
|
return ENXIO;
|
|
sc = softcv[unit];
|
|
if (! sc)
|
|
return ENXIO;
|
|
sc->kflags |= SKF_CDEVOPEN;
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
srt_close(dev_t dev, int flag, int mode, struct lwp *l)
|
|
{
|
|
int unit;
|
|
struct srt_softc *sc;
|
|
|
|
unit = minor(dev);
|
|
if (unit < 0 || unit > SRT_MAXUNIT)
|
|
return ENXIO;
|
|
sc = softcv[unit];
|
|
if (! sc)
|
|
return ENXIO;
|
|
sc->kflags &= ~SKF_CDEVOPEN;
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
srt_ioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l)
|
|
{
|
|
unsigned int f, i, n, o;
|
|
struct srt_softc *sc;
|
|
struct srt_rt *dr;
|
|
struct srt_rt *scr;
|
|
struct ifnet *ifp;
|
|
char nbuf[IFNAMSIZ];
|
|
|
|
sc = softcv[minor(dev)];
|
|
if (! sc)
|
|
panic("srt_ioctl: softc disappeared");
|
|
switch (cmd) {
|
|
case SRT_GETNRT:
|
|
if (! (flag & FREAD))
|
|
return EBADF;
|
|
*(unsigned int *)data = sc->nrt;
|
|
return 0;
|
|
case SRT_GETRT:
|
|
if (! (flag & FREAD))
|
|
return EBADF;
|
|
dr = (struct srt_rt *) data;
|
|
if (dr->inx >= sc->nrt)
|
|
return EDOM;
|
|
scr = sc->rts[dr->inx];
|
|
dr->af = scr->af;
|
|
dr->srcmatch = scr->srcmatch;
|
|
dr->srcmask = scr->srcmask;
|
|
strlcpy(&dr->u.dstifn[0],&scr->u.dstifp->if_xname[0],IFNAMSIZ);
|
|
memcpy(&dr->dst,&scr->dst,scr->dst.sa.sa_len);
|
|
return 0;
|
|
case SRT_SETRT:
|
|
if (! (flag & FWRITE))
|
|
return EBADF;
|
|
dr = (struct srt_rt *) data;
|
|
if (dr->inx > sc->nrt)
|
|
return EDOM;
|
|
strlcpy(&nbuf[0],&dr->u.dstifn[0],IFNAMSIZ);
|
|
nbuf[IFNAMSIZ-1] = '\0';
|
|
if (dr->dst.sa.sa_family != dr->af)
|
|
return EIO;
|
|
switch (dr->af) {
|
|
#ifdef INET
|
|
case AF_INET:
|
|
if (dr->dst.sa.sa_len != sizeof(dr->dst.sin))
|
|
return EIO;
|
|
if (dr->srcmask > 32)
|
|
return EIO;
|
|
break;
|
|
#endif
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
if (dr->dst.sa.sa_len != sizeof(dr->dst.sin6))
|
|
return EIO;
|
|
if (dr->srcmask > 128)
|
|
return EIO;
|
|
break;
|
|
#endif
|
|
default:
|
|
return EAFNOSUPPORT;
|
|
}
|
|
ifp = ifunit(&nbuf[0]);
|
|
if (ifp == 0)
|
|
return ENXIO; /* needs translation */
|
|
if (dr->inx == sc->nrt) {
|
|
struct srt_rt **tmp;
|
|
tmp = malloc((sc->nrt+1)*sizeof(*tmp), M_DEVBUF,
|
|
M_WAITOK);
|
|
if (tmp == 0)
|
|
return ENOBUFS;
|
|
tmp[sc->nrt] = 0;
|
|
if (sc->nrt > 0) {
|
|
memcpy(tmp, sc->rts, sc->nrt*sizeof(*tmp));
|
|
free(sc->rts, M_DEVBUF);
|
|
}
|
|
sc->rts = tmp;
|
|
sc->nrt ++;
|
|
}
|
|
scr = sc->rts[dr->inx];
|
|
if (scr == 0) {
|
|
scr = malloc(sizeof(struct srt_rt),M_DEVBUF,M_WAITOK);
|
|
if (scr == 0)
|
|
return ENOBUFS;
|
|
scr->inx = dr->inx;
|
|
scr->af = AF_UNSPEC;
|
|
sc->rts[dr->inx] = scr;
|
|
}
|
|
scr->af = dr->af;
|
|
scr->srcmatch = dr->srcmatch;
|
|
scr->srcmask = dr->srcmask;
|
|
scr->u.dstifp = ifp;
|
|
memcpy(&scr->dst,&dr->dst,dr->dst.sa.sa_len);
|
|
if (dr->af == AF_INET6)
|
|
in6_setzoneid(&scr->dst.sin6.sin6_addr, ifp->if_index);
|
|
update_mtu(sc);
|
|
return 0;
|
|
case SRT_DELRT:
|
|
if (! (flag & FWRITE))
|
|
return EBADF;
|
|
i = *(unsigned int *)data;
|
|
if (i >= sc->nrt)
|
|
return EDOM;
|
|
scr = sc->rts[i];
|
|
sc->rts[i] = 0;
|
|
free(scr, M_DEVBUF);
|
|
sc->nrt--;
|
|
if (i < sc->nrt) {
|
|
memcpy(sc->rts+i, sc->rts+i+1,
|
|
(sc->nrt-i)*sizeof(*sc->rts));
|
|
}
|
|
if (sc->nrt == 0) {
|
|
free(sc->rts, M_DEVBUF);
|
|
sc->rts = 0;
|
|
sc->intf.if_flags &= ~IFF_UP;
|
|
}
|
|
update_mtu(sc);
|
|
return 0;
|
|
case SRT_SFLAGS:
|
|
if (! (flag & FWRITE))
|
|
return EBADF;
|
|
f = *(unsigned int *)data & SSF_UCHG;
|
|
global_flags = (global_flags & ~SSF_UCHG) | (f & SSF_GLOBAL);
|
|
sc->flags = (sc->flags & ~SSF_UCHG) | (f & ~SSF_GLOBAL);
|
|
return 0;
|
|
case SRT_GFLAGS:
|
|
if (! (flag & FREAD))
|
|
return EBADF;
|
|
*(unsigned int *)data = sc->flags | global_flags;
|
|
return 0;
|
|
case SRT_SGFLAGS:
|
|
if ((flag & (FWRITE|FREAD)) != (FWRITE|FREAD))
|
|
return EBADF;
|
|
o = sc->flags | global_flags;
|
|
n = *(unsigned int *)data & SSF_UCHG;
|
|
global_flags = (global_flags & ~SSF_UCHG) | (n & SSF_GLOBAL);
|
|
sc->flags = (sc->flags & ~SSF_UCHG) | (n & ~SSF_GLOBAL);
|
|
*(unsigned int *)data = o;
|
|
return 0;
|
|
case SRT_DEBUG:
|
|
return 0;
|
|
break;
|
|
}
|
|
return ENOTTY;
|
|
}
|
|
|
|
const struct cdevsw srt_cdevsw = {
|
|
.d_open = srt_open,
|
|
.d_close = srt_close,
|
|
.d_read = nullread,
|
|
.d_write = nullwrite,
|
|
.d_ioctl = srt_ioctl,
|
|
.d_stop = nullstop,
|
|
.d_tty = notty,
|
|
.d_poll = nullpoll,
|
|
.d_mmap = nommap,
|
|
.d_kqfilter = nullkqfilter,
|
|
.d_discard = nodiscard,
|
|
.d_flag = D_OTHER
|
|
};
|
|
|
|
/*
|
|
* Module infrastructure
|
|
*/
|
|
#include "if_module.h"
|
|
|
|
IF_MODULE(MODULE_CLASS_DRIVER, srt, "")
|