NetBSD-5.0.2/sys/net/if_srt.c
/* $NetBSD: if_srt.c,v 1.8 2008/06/15 16:37:21 christos Exp $ */
/* This file is in the public domain. */
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: if_srt.c,v 1.8 2008/06/15 16:37:21 christos Exp $");
#include "opt_inet.h"
#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 <netinet/ip.h>
#include <netinet/ip6.h>
#include <net/if_types.h>
#include <machine/stdarg.h>
#include "if_srt.h"
#include "bpfilter.h"
/* until we know what to pass to bpfattach.... */
#undef NBPFILTER
#define NBPFILTER 0
typedef struct srt_rt RT;
typedef struct softc SOFTC;
struct softc {
struct ifnet intf; /* XXX interface botch */
int unit;
int nrt;
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
} ;
static SOFTC *softcv[SRT_MAXUNIT+1];
static unsigned int global_flags;
/* 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(SOFTC *sc)
{
int mtu;
int i;
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 RT *find_rt(SOFTC *sc, int af, ...)
{
int i;
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 & ipv4_masks[r->srcmask]) == r->srcmatch.v4.s_addr) return(r);
break;
case AF_INET6:
if ((r->srcmask >= 8) && bcmp(&ia6,&r->srcmatch.v6,r->srcmask/8)) 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);
break;
default:
panic("if_srt find_rt: impossible address family 2");
break;
}
}
return(0);
}
/* Network device interface. */
static int srt_if_ioctl(struct ifnet *intf, u_long cmd, void *data)
{
struct ifaddr *ifa;
int s;
int err;
err = 0;
s = splnet();
switch (cmd)
{ case SIOCSIFADDR:
case SIOCSIFDSTADDR:
ifa = (void *) data;
switch (ifa->ifa_addr->sa_family)
{
#ifdef INET
case AF_INET:
#endif
#ifdef INET6
case AF_INET6:
#endif
break;
default:
err = EAFNOSUPPORT;
break;
}
/* XXX do we need to do more here for either of these? */
break;
case SIOCSIFMTU:
case SIOCGIFMTU:
if ((err = ifioctl_common(intf, cmd, data)) == ENETRESET)
err = 0;
break;
default:
err = EINVAL;
break;
}
splx(s);
return(err);
}
static int srt_if_output(
struct ifnet *intf,
struct mbuf *m,
const struct sockaddr *to,
struct rtentry *rtp )
{
SOFTC *sc;
RT *r;
sc = intf->if_softc;
if (! (intf->if_flags & IFF_UP))
{ m_freem(m);
return(ENETDOWN);
}
switch (to->sa_family)
{
#ifdef INET
case AF_INET:
#endif
{ struct ip *ip;
ip = mtod(m,struct ip *);
r = find_rt(sc,AF_INET,ip->ip_src);
}
break;
#ifdef INET6
case AF_INET6:
#endif
{ struct ip6_hdr *ip;
ip = mtod(m,struct ip6_hdr *);
r = find_rt(sc,AF_INET6,ip->ip6_src);
}
break;
default:
IF_DROP(&intf->if_snd);
m_freem(m);
return(EAFNOSUPPORT);
break;
}
/* XXX Do we need to bpf_tap? Or do higher layers now handle that? */
/* if_gif.c seems to imply the latter. */
intf->if_opackets ++;
if (! r)
{ intf->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);
}
intf->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? */
return((*r->u.dstifp->if_output)(r->u.dstifp,m,&r->dst.sa,0));
}
static int srt_clone_create(struct if_clone *cl, int unit)
{
SOFTC *sc;
if ((unit < 0) || (unit > SRT_MAXUNIT)) return(ENXIO);
if (softcv[unit]) return(EBUSY);
sc = malloc(sizeof(SOFTC),M_DEVBUF,M_WAIT);
bzero(&sc->intf,sizeof(sc->intf)); /* XXX */
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);
#if NBPFILTER > 0 /* see comment near top */
bpfattach(&sc->intf,0/*???*/,0/*???*/);
#endif
softcv[unit] = sc;
return(0);
}
static int srt_clone_destroy(struct ifnet *intf)
{
SOFTC *sc;
sc = intf->if_softc;
if ((intf->if_flags & IFF_UP) || (sc->kflags & SKF_CDEVOPEN)) return(EBUSY);
#if NBPFILTER > 0
bpfdetach(intf);
#endif
if_detach(intf);
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);
return(0);
}
struct if_clone srt_clone =
IF_CLONE_INITIALIZER("srt",&srt_clone_create,&srt_clone_destroy);
extern void srtattach(void);
void srtattach(void)
{
int i;
for (i=SRT_MAXUNIT;i>=0;i--) softcv[i] = 0;
global_flags = 0;
if_clone_attach(&srt_clone);
}
/* Special-device interface. */
static int srt_open(dev_t dev, int flag, int mode, struct lwp *l)
{
int unit;
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;
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 )
{
SOFTC *sc;
RT *dr;
RT *scr;
struct ifnet *intf;
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);
break;
case SRT_GETRT:
if (! (flag & FREAD)) return(EBADF);
dr = (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;
strncpy(&dr->u.dstifn[0],&scr->u.dstifp->if_xname[0],IFNAMSIZ);
memcpy(&dr->dst,&scr->dst,scr->dst.sa.sa_len);
return(0);
break;
case SRT_SETRT:
if (! (flag & FWRITE)) return(EBADF);
dr = (RT *) data;
if (dr->inx > sc->nrt) return(EDOM);
strncpy(&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
break;
default:
return(EAFNOSUPPORT);
break;
}
intf = ifunit(&nbuf[0]);
if (intf == 0) return(ENXIO); /* needs translation */
if (dr->inx == sc->nrt)
{ 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(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 = intf;
memcpy(&scr->dst,&dr->dst,dr->dst.sa.sa_len);
update_mtu(sc);
return(0);
break;
case SRT_DELRT:
{ unsigned int i;
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);
break;
case SRT_SFLAGS:
{ unsigned int f;
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);
break;
case SRT_GFLAGS:
if (! (flag & FREAD)) return(EBADF);
*(unsigned int *)data = sc->flags | global_flags;
return(0);
break;
case SRT_SGFLAGS:
{ unsigned int o;
unsigned int n;
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);
break;
case SRT_DEBUG:
return(0);
break;
}
return(ENOTTY);
}
const struct cdevsw srt_cdevsw
= { &srt_open,
&srt_close,
nullread,
nullwrite,
&srt_ioctl,
nullstop,
notty,
nullpoll,
nommap,
nullkqfilter,
D_OTHER };