#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/errno.h>
#include <sys/time.h>
#include <sys/syslog.h>
#include <sys/protosw.h>
#include <kern/cpu_number.h>
#include <net/if.h>
#include <net/if_types.h>
#include <net/route.h>
#include <net/bpf.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#if INET
#include <netinet/in_var.h>
#include <netinet/in_gif.h>
#include <netinet/ip_var.h>
#endif
#if INET6
#include <netinet6/in6_var.h>
#include <netinet/ip6.h>
#include <netinet6/ip6_var.h>
#include <netinet6/in6_gif.h>
#include <netinet6/ip6protosw.h>
#endif
#include <netinet/ip_encap.h>
#include <net/dlil.h>
#include <net/if_gif.h>
#include <net/net_osdep.h>
#define GIFNAME "gif"
#define GIFDEV "if_gif"
#define GIF_MAXUNIT 0x7fff
#ifndef __APPLE__
static MALLOC_DEFINE(M_GIF, "gif", "Generic Tunnel Interface");
#endif
TAILQ_HEAD(gifhead, gif_softc) gifs = TAILQ_HEAD_INITIALIZER(gifs);
#ifdef __APPLE__
void gifattach(void);
int gif_pre_output(struct ifnet *ifp, u_long protocol_family, struct mbuf **m0,
const struct sockaddr *dst, caddr_t rt, char *frame, char *address);
static void gif_create_dev(void);
static int gif_encapcheck(const struct mbuf*, int, int, void*);
int ngif = 0;
#endif
#if INET
struct protosw in_gif_protosw =
{ SOCK_RAW, 0, 0, PR_ATOMIC|PR_ADDR,
in_gif_input, 0, 0, 0,
0,
0, 0, 0, 0,
0,
&rip_usrreqs,
0, rip_unlock, 0
};
#endif
#if INET6
struct ip6protosw in6_gif_protosw =
{ SOCK_RAW, 0, 0, PR_ATOMIC|PR_ADDR,
in6_gif_input, 0, 0, 0,
0,
0, 0, 0, 0,
0,
&rip6_usrreqs,
0, rip_unlock, 0,
};
#endif
#ifndef MAX_GIF_NEST
#define MAX_GIF_NEST 1
#endif
static int max_gif_nesting = MAX_GIF_NEST;
#ifdef __APPLE__
int gif_demux(
struct ifnet *ifp,
struct mbuf *m,
char *frame_header,
u_long *protocol_family)
{
struct gif_softc* gif = (struct gif_softc*)ifp->if_softc;
*protocol_family = gif->gif_proto;
return 0;
}
static
int gif_add_proto(struct ifnet *ifp, u_long protocol_family, struct ddesc_head_str *desc_head)
{
struct gif_softc* gif = (struct gif_softc*)ifp->if_softc;
if (gif->gif_proto != 0)
printf("gif_add_proto: request add_proto for gif%d\n", gif->gif_if.if_unit);
gif->gif_proto = protocol_family;
return 0;
}
static
int gif_del_proto(struct ifnet *ifp, u_long protocol_family)
{
if (((struct gif_softc*)ifp)->gif_proto == protocol_family)
((struct gif_softc*)ifp)->gif_proto = 0;
else
return ENOENT;
return 0;
}
int
gif_attach_proto_family(
struct ifnet *ifp,
u_long protocol_family)
{
struct dlil_proto_reg_str reg;
int stat;
bzero(®, sizeof(reg));
TAILQ_INIT(®.demux_desc_head);
reg.interface_family = ifp->if_family;
reg.unit_number = ifp->if_unit;
reg.input = gif_input;
reg.pre_output = gif_pre_output;
reg.protocol_family = protocol_family;
stat = dlil_attach_protocol(®);
if (stat && stat != EEXIST) {
panic("gif_attach_proto_family can't attach interface fam=%d\n", protocol_family);
}
return stat;
}
#endif
void
gifattach(void)
{
int error;
TAILQ_INIT(&gifs);
if ( error = dlil_reg_proto_module(AF_INET, APPLE_IF_FAM_GIF, gif_attach_proto_family, NULL) != 0)
printf("dlil_reg_proto_module failed for AF_INET error=%d\n", error);
if ( error = dlil_reg_proto_module(AF_INET6, APPLE_IF_FAM_GIF, gif_attach_proto_family, NULL) != 0)
printf("dlil_reg_proto_module failed for AF_INET6 error=%d\n", error);
gif_create_dev();
}
static void
gif_create_dev(void)
{
struct gif_softc *sc;
if (ngif >= GIF_MAXUNIT)
return;
TAILQ_FOREACH(sc, &gifs, gif_link) {
if ((sc->gif_if.if_flags & IFF_RUNNING) == 0)
return;
}
sc = _MALLOC(sizeof(struct gif_softc), M_DEVBUF, M_WAITOK);
if (sc == NULL) {
log(LOG_ERR, "gifattach: failed to allocate gif%d\n", ngif);
return;
}
bzero(sc, sizeof(struct gif_softc));
sc->gif_if.if_softc = sc;
sc->gif_if.if_name = GIFNAME;
sc->gif_if.if_unit = ngif;
sc->encap_cookie4 = sc->encap_cookie6 = NULL;
#ifdef INET
sc->encap_cookie4 = encap_attach_func(AF_INET, -1,
gif_encapcheck, &in_gif_protosw, sc);
if (sc->encap_cookie4 == NULL) {
printf("%s: unable to attach encap4\n", if_name(&sc->gif_if));
FREE(sc, M_DEVBUF);
return;
}
#endif
#ifdef INET6
sc->encap_cookie6 = encap_attach_func(AF_INET6, -1,
gif_encapcheck, (struct protosw*)&in6_gif_protosw, sc);
if (sc->encap_cookie6 == NULL) {
if (sc->encap_cookie4) {
encap_detach(sc->encap_cookie4);
sc->encap_cookie4 = NULL;
}
printf("%s: unable to attach encap6\n", if_name(&sc->gif_if));
FREE(sc, M_DEVBUF);
return;
}
#endif
sc->gif_called = 0;
sc->gif_if.if_family= APPLE_IF_FAM_GIF;
sc->gif_if.if_mtu = GIF_MTU;
sc->gif_if.if_flags = IFF_POINTOPOINT | IFF_MULTICAST;
#if 0
sc->gif_if.if_flags |= IFF_LINK2;
#endif
sc->gif_if.if_demux = gif_demux;
sc->gif_if.if_ioctl = gif_ioctl;
sc->gif_if.if_output = NULL;
sc->gif_if.if_type = IFT_GIF;
sc->gif_if.if_add_proto = gif_add_proto;
sc->gif_if.if_del_proto = gif_del_proto;
dlil_if_attach(&sc->gif_if);
bpfattach(&sc->gif_if, DLT_NULL, sizeof(u_int));
TAILQ_INSERT_TAIL(&gifs, sc, gif_link);
ngif++;
}
static int
gif_encapcheck(m, off, proto, arg)
const struct mbuf *m;
int off;
int proto;
void *arg;
{
struct ip ip;
struct gif_softc *sc;
sc = (struct gif_softc *)arg;
if (sc == NULL)
return 0;
if ((sc->gif_if.if_flags & IFF_UP) == 0)
return 0;
if (!sc->gif_psrc || !sc->gif_pdst)
return 0;
switch (proto) {
#if INET
case IPPROTO_IPV4:
break;
#endif
#if INET6
case IPPROTO_IPV6:
break;
#endif
default:
return 0;
}
m_copydata((struct mbuf *)m, 0, sizeof(ip), (caddr_t)&ip);
switch (ip.ip_v) {
#if INET
case 4:
if (sc->gif_psrc->sa_family != AF_INET ||
sc->gif_pdst->sa_family != AF_INET)
return 0;
return gif_encapcheck4(m, off, proto, arg);
#endif
#if INET6
case 6:
if (sc->gif_psrc->sa_family != AF_INET6 ||
sc->gif_pdst->sa_family != AF_INET6)
return 0;
return gif_encapcheck6(m, off, proto, arg);
#endif
default:
return 0;
}
}
int
gif_pre_output(
struct ifnet *ifp,
u_long protocol_family,
struct mbuf **m0,
const struct sockaddr *dst,
caddr_t rt,
char *frame,
char *address)
{
struct gif_softc *sc = (struct gif_softc*)ifp;
register struct mbuf * m = *m0;
int error = 0;
if (++sc->gif_called > max_gif_nesting) {
log(LOG_NOTICE,
"gif_output: recursively called too many times(%d)\n",
sc->gif_called);
m_freem(m);
error = EIO;
goto end;
}
ifnet_touch_lastchange(ifp);
m->m_flags &= ~(M_BCAST|M_MCAST);
if (!(ifp->if_flags & IFF_UP) ||
sc->gif_psrc == NULL || sc->gif_pdst == NULL) {
m_freem(m);
error = ENETDOWN;
goto end;
}
if (ifp->if_bpf) {
struct mbuf m0;
u_int32_t protocol_family = dst->sa_family;
m0.m_next = m;
m0.m_len = 4;
m0.m_data = (char *)&protocol_family;
bpf_mtap(ifp, &m0);
}
ifp->if_opackets++;
ifp->if_obytes += m->m_pkthdr.len;
switch (sc->gif_psrc->sa_family) {
#if INET
case AF_INET:
error = in_gif_output(ifp, dst->sa_family, m, (struct rtentry*)rt);
break;
#endif
#if INET6
case AF_INET6:
error = in6_gif_output(ifp, dst->sa_family, m, (struct rtentry*)rt);
break;
#endif
default:
error = ENETDOWN;
goto end;
}
end:
sc->gif_called = 0;
if (error) {
*m0 = NULL;
ifp->if_oerrors++;
}
if (error == 0)
error = EJUSTRETURN;
return error;
}
int
gif_input(
struct mbuf *m,
char* frame_header,
struct ifnet* gifp,
u_long protocol_family,
int sync_ok)
{
if (gifp == NULL) {
m_freem(m);
return;
}
if (m->m_pkthdr.rcvif)
m->m_pkthdr.rcvif = gifp;
if (gifp->if_bpf) {
struct mbuf m0;
u_int32_t protocol_family1 = protocol_family;
m0.m_next = m;
m0.m_len = 4;
m0.m_data = (char *)&protocol_family1;
bpf_mtap(gifp, &m0);
}
proto_input(protocol_family, m);
gifp->if_ipackets++;
gifp->if_ibytes += m->m_pkthdr.len;
return (0);
}
int
gif_ioctl(ifp, cmd, data)
struct ifnet *ifp;
u_long cmd;
void* data;
{
struct gif_softc *sc = (struct gif_softc*)ifp;
struct ifreq *ifr = (struct ifreq*)data;
int error = 0, size;
struct sockaddr *dst, *src;
struct sockaddr *sa;
int s;
struct ifnet *ifp2;
struct gif_softc *sc2;
switch (cmd) {
case SIOCSIFADDR:
break;
case SIOCSIFDSTADDR:
break;
case SIOCADDMULTI:
case SIOCDELMULTI:
break;
#ifdef SIOCSIFMTU
case SIOCGIFMTU:
break;
case SIOCSIFMTU:
{
u_long mtu;
mtu = ifr->ifr_mtu;
if (mtu < GIF_MTU_MIN || mtu > GIF_MTU_MAX) {
return (EINVAL);
}
ifp->if_mtu = mtu;
}
break;
#endif
case SIOCSIFPHYADDR:
#if INET6
case SIOCSIFPHYADDR_IN6:
#endif
case SIOCSLIFPHYADDR:
switch (cmd) {
#if INET
case SIOCSIFPHYADDR:
src = (struct sockaddr *)
&(((struct in_aliasreq *)data)->ifra_addr);
dst = (struct sockaddr *)
&(((struct in_aliasreq *)data)->ifra_dstaddr);
break;
#endif
#if INET6
case SIOCSIFPHYADDR_IN6:
src = (struct sockaddr *)
&(((struct in6_aliasreq *)data)->ifra_addr);
dst = (struct sockaddr *)
&(((struct in6_aliasreq *)data)->ifra_dstaddr);
break;
#endif
case SIOCSLIFPHYADDR:
src = (struct sockaddr *)
&(((struct if_laddrreq *)data)->addr);
dst = (struct sockaddr *)
&(((struct if_laddrreq *)data)->dstaddr);
}
if (src->sa_family != dst->sa_family)
return EINVAL;
switch (src->sa_family) {
#if INET
case AF_INET:
if (src->sa_len != sizeof(struct sockaddr_in))
return EINVAL;
break;
#endif
#if INET6
case AF_INET6:
if (src->sa_len != sizeof(struct sockaddr_in6))
return EINVAL;
break;
#endif
default:
return EAFNOSUPPORT;
}
switch (dst->sa_family) {
#if INET
case AF_INET:
if (dst->sa_len != sizeof(struct sockaddr_in))
return EINVAL;
break;
#endif
#if INET6
case AF_INET6:
if (dst->sa_len != sizeof(struct sockaddr_in6))
return EINVAL;
break;
#endif
default:
return EAFNOSUPPORT;
}
switch (cmd) {
case SIOCSIFPHYADDR:
if (src->sa_family == AF_INET)
break;
return EAFNOSUPPORT;
#if INET6
case SIOCSIFPHYADDR_IN6:
if (src->sa_family == AF_INET6)
break;
return EAFNOSUPPORT;
#endif
case SIOCSLIFPHYADDR:
break;
}
ifnet_head_lock_shared();
TAILQ_FOREACH(ifp2, &ifnet_head, if_link) {
if (strcmp(ifp2->if_name, GIFNAME) != 0)
continue;
sc2 = ifp2->if_softc;
if (sc2 == sc)
continue;
if (!sc2->gif_pdst || !sc2->gif_psrc)
continue;
if (sc2->gif_pdst->sa_family != dst->sa_family ||
sc2->gif_pdst->sa_len != dst->sa_len ||
sc2->gif_psrc->sa_family != src->sa_family ||
sc2->gif_psrc->sa_len != src->sa_len)
continue;
#ifndef XBONEHACK
if (bcmp(sc2->gif_pdst, dst, dst->sa_len) == 0 &&
bcmp(sc2->gif_psrc, src, src->sa_len) == 0) {
error = EADDRNOTAVAIL;
ifnet_head_done();
goto bad;
}
#endif
#define multidest(x) \
(((struct sockaddr_in *)(x))->sin_addr.s_addr == INADDR_ANY)
#if INET6
#define multidest6(x) \
(IN6_IS_ADDR_UNSPECIFIED(&((struct sockaddr_in6 *)(x))->sin6_addr))
#endif
if (dst->sa_family == AF_INET &&
multidest(dst) && multidest(sc2->gif_pdst)) {
error = EADDRNOTAVAIL;
ifnet_head_done();
goto bad;
}
#if INET6
if (dst->sa_family == AF_INET6 &&
multidest6(dst) && multidest6(sc2->gif_pdst)) {
error = EADDRNOTAVAIL;
ifnet_head_done();
goto bad;
}
#endif
}
ifnet_head_done();
if (sc->gif_psrc)
FREE((caddr_t)sc->gif_psrc, M_IFADDR);
sa = (struct sockaddr *)_MALLOC(src->sa_len, M_IFADDR, M_WAITOK);
bcopy((caddr_t)src, (caddr_t)sa, src->sa_len);
sc->gif_psrc = sa;
if (sc->gif_pdst)
FREE((caddr_t)sc->gif_pdst, M_IFADDR);
sa = (struct sockaddr *)_MALLOC(dst->sa_len, M_IFADDR, M_WAITOK);
bcopy((caddr_t)dst, (caddr_t)sa, dst->sa_len);
sc->gif_pdst = sa;
ifp->if_flags |= IFF_RUNNING;
s = splimp();
if_up(ifp);
#ifdef __APPLE__
gif_create_dev();
#endif
splx(s);
error = 0;
break;
#ifdef SIOCDIFPHYADDR
case SIOCDIFPHYADDR:
if (sc->gif_psrc) {
FREE((caddr_t)sc->gif_psrc, M_IFADDR);
sc->gif_psrc = NULL;
}
if (sc->gif_pdst) {
FREE((caddr_t)sc->gif_pdst, M_IFADDR);
sc->gif_pdst = NULL;
}
break;
#endif
case SIOCGIFPSRCADDR:
#if INET6
case SIOCGIFPSRCADDR_IN6:
#endif
if (sc->gif_psrc == NULL) {
error = EADDRNOTAVAIL;
goto bad;
}
src = sc->gif_psrc;
switch (cmd) {
#if INET
case SIOCGIFPSRCADDR:
dst = &ifr->ifr_addr;
size = sizeof(ifr->ifr_addr);
break;
#endif
#if INET6
case SIOCGIFPSRCADDR_IN6:
dst = (struct sockaddr *)
&(((struct in6_ifreq *)data)->ifr_addr);
size = sizeof(((struct in6_ifreq *)data)->ifr_addr);
break;
#endif
default:
error = EADDRNOTAVAIL;
goto bad;
}
if (src->sa_len > size)
return EINVAL;
bcopy((caddr_t)src, (caddr_t)dst, src->sa_len);
break;
case SIOCGIFPDSTADDR:
#if INET6
case SIOCGIFPDSTADDR_IN6:
#endif
if (sc->gif_pdst == NULL) {
error = EADDRNOTAVAIL;
goto bad;
}
src = sc->gif_pdst;
switch (cmd) {
#if INET
case SIOCGIFPDSTADDR:
dst = &ifr->ifr_addr;
size = sizeof(ifr->ifr_addr);
break;
#endif
#if INET6
case SIOCGIFPDSTADDR_IN6:
dst = (struct sockaddr *)
&(((struct in6_ifreq *)data)->ifr_addr);
size = sizeof(((struct in6_ifreq *)data)->ifr_addr);
break;
#endif
default:
error = EADDRNOTAVAIL;
goto bad;
}
if (src->sa_len > size)
return EINVAL;
bcopy((caddr_t)src, (caddr_t)dst, src->sa_len);
break;
case SIOCGLIFPHYADDR:
if (sc->gif_psrc == NULL || sc->gif_pdst == NULL) {
error = EADDRNOTAVAIL;
goto bad;
}
src = sc->gif_psrc;
dst = (struct sockaddr *)
&(((struct if_laddrreq *)data)->addr);
size = sizeof(((struct if_laddrreq *)data)->addr);
if (src->sa_len > size)
return EINVAL;
bcopy((caddr_t)src, (caddr_t)dst, src->sa_len);
src = sc->gif_pdst;
dst = (struct sockaddr *)
&(((struct if_laddrreq *)data)->dstaddr);
size = sizeof(((struct if_laddrreq *)data)->dstaddr);
if (src->sa_len > size)
return EINVAL;
bcopy((caddr_t)src, (caddr_t)dst, src->sa_len);
break;
case SIOCSIFFLAGS:
break;
default:
error = EOPNOTSUPP;
break;
}
bad:
return error;
}
#ifndef __APPLE__
void
gif_delete_tunnel(sc)
struct gif_softc *sc;
{
if (sc->gif_psrc) {
FREE((caddr_t)sc->gif_psrc, M_IFADDR);
sc->gif_psrc = NULL;
}
if (sc->gif_pdst) {
FREE((caddr_t)sc->gif_pdst, M_IFADDR);
sc->gif_pdst = NULL;
}
}
#endif