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Add RFC 3378 EtherIP support. This change makes it possible to add gif

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interfaces to bridges, which will then send and receive IP protocol 97 packets.
Packets are Ethernet frames with an EtherIP header prepended.

Obtained from:	NetBSD
MFC after:	2 weeks
This commit is contained in:
Andrew Thompson 2005-12-21 21:29:45 +00:00
parent 373d1a3f8c
commit 73ff045c57
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=153621
7 changed files with 160 additions and 10 deletions
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17
share/man/man4/if_bridge.4
View File

@ -173,7 +173,24 @@ ifconfig bridge0 \e
addm fxp7 stp fxp7 \e
up
.Ed
.Pp
The bridge can tunnel Ethernet across an IP internet using the EtherIP
protocol.
This can be combined with
.Xr ipsec 4
to provide an encrypted connection.
Create a
.Xr gif 4
interface and set the local and remote IP addresses for the
tunnel, these are reversed on the remote bridge.
.Bd -literal -offset indent
ifconfig gif0 create
ifconfig gif0 tunnel 1.2.3.4 5.6.7.8 up
ifconfig bridge0 create
ifconfig bridge0 addm fxp0 addm gif0 up
.Ed
.Sh SEE ALSO
.Xr gif 4 ,
.Xr ipf 4 ,
.Xr ipfw 4 ,
.Xr pf 4 ,

26
sys/net/if_bridge.c
View File

@ -724,6 +724,9 @@ bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif,
(void) ifpromisc(ifs, 0);
break;
case IFT_GIF:
break;
default:
#ifdef DIAGNOSTIC
panic("bridge_delete_member: impossible");
@ -781,12 +784,15 @@ bridge_ioctl_add(struct bridge_softc *sc, void *arg)
if (ifs == bif->bif_ifp)
return (EBUSY);
/* Allow the first member to define the MTU */
if (LIST_EMPTY(&sc->sc_iflist))
sc->sc_ifp->if_mtu = ifs->if_mtu;
else if (sc->sc_ifp->if_mtu != ifs->if_mtu) {
if_printf(sc->sc_ifp, "invalid MTU for %s\n", ifs->if_xname);
return (EINVAL);
/* Allow the first Ethernet member to define the MTU */
if (ifs->if_type != IFT_GIF) {
if (LIST_EMPTY(&sc->sc_iflist))
sc->sc_ifp->if_mtu = ifs->if_mtu;
else if (sc->sc_ifp->if_mtu != ifs->if_mtu) {
if_printf(sc->sc_ifp, "invalid MTU for %s\n",
ifs->if_xname);
return (EINVAL);
}
}
if (ifs->if_bridge == sc)
@ -810,6 +816,9 @@ bridge_ioctl_add(struct bridge_softc *sc, void *arg)
goto out;
break;
case IFT_GIF:
break;
default:
error = EINVAL;
goto out;
@ -1553,6 +1562,9 @@ bridge_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa,
LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
dst_if = bif->bif_ifp;
if (dst_if->if_type == IFT_GIF)
continue;
if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0)
continue;
@ -1944,6 +1956,8 @@ bridge_input(struct ifnet *ifp, struct mbuf *m)
* Unicast. Make sure it's not for us.
*/
LIST_FOREACH(bif, &sc->sc_iflist, bif_next) {
if(bif->bif_ifp->if_type == IFT_GIF)
continue;
/* It is destined for us. */
if (memcmp(IF_LLADDR(bif->bif_ifp), eh->ether_dhost,
ETHER_ADDR_LEN) == 0) {

71
sys/net/if_gif.c
View File

@ -80,6 +80,8 @@
#endif /* INET6 */
#include <netinet/ip_encap.h>
#include <net/ethernet.h>
#include <net/if_bridgevar.h>
#include <net/if_gif.h>
#include <net/net_osdep.h>
@ -99,6 +101,7 @@ void (*ng_gif_input_orphan_p)(struct ifnet *ifp, struct mbuf *m, int af);
void (*ng_gif_attach_p)(struct ifnet *ifp);
void (*ng_gif_detach_p)(struct ifnet *ifp);
static void gif_start(struct ifnet *);
static int gif_clone_create(struct if_clone *, int);
static void gif_clone_destroy(struct ifnet *);
@ -177,6 +180,7 @@ gifattach0(sc)
GIF2IFP(sc)->if_flags |= IFF_LINK2;
#endif
GIF2IFP(sc)->if_ioctl = gif_ioctl;
GIF2IFP(sc)->if_start = gif_start;
GIF2IFP(sc)->if_output = gif_output;
GIF2IFP(sc)->if_snd.ifq_maxlen = IFQ_MAXLEN;
if_attach(GIF2IFP(sc));
@ -289,6 +293,9 @@ gif_encapcheck(m, off, proto, arg)
case IPPROTO_IPV6:
break;
#endif
case IPPROTO_ETHERIP:
break;
default:
return 0;
}
@ -321,6 +328,28 @@ gif_encapcheck(m, off, proto, arg)
}
}
static void
gif_start(struct ifnet *ifp)
{
struct gif_softc *sc;
struct mbuf *m;
sc = ifp->if_softc;
ifp->if_drv_flags |= IFF_DRV_OACTIVE;
for (;;) {
IFQ_DEQUEUE(&ifp->if_snd, m);
if (m == 0)
break;
gif_output(ifp, m, sc->gif_pdst, NULL);
}
ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
return;
}
int
gif_output(ifp, m, dst, rt)
struct ifnet *ifp;
@ -395,13 +424,17 @@ gif_output(ifp, m, dst, rt)
dst->sa_family = af;
}
af = dst->sa_family;
if (ifp->if_bpf) {
af = dst->sa_family;
bpf_mtap2(ifp->if_bpf, &af, sizeof(af), m);
}
ifp->if_opackets++;
ifp->if_obytes += m->m_pkthdr.len;
/* override to IPPROTO_ETHERIP for bridged traffic */
if (ifp->if_bridge)
af = AF_LINK;
/* inner AF-specific encapsulation */
/* XXX should we check if our outer source is legal? */
@ -410,12 +443,12 @@ gif_output(ifp, m, dst, rt)
switch (sc->gif_psrc->sa_family) {
#ifdef INET
case AF_INET:
error = in_gif_output(ifp, dst->sa_family, m);
error = in_gif_output(ifp, af, m);
break;
#endif
#ifdef INET6
case AF_INET6:
error = in6_gif_output(ifp, dst->sa_family, m);
error = in6_gif_output(ifp, af, m);
break;
#endif
default:
@ -436,7 +469,8 @@ gif_input(m, af, ifp)
int af;
struct ifnet *ifp;
{
int isr;
int isr, n;
struct etherip_header *eip;
if (ifp == NULL) {
/* just in case */
@ -483,6 +517,35 @@ gif_input(m, af, ifp)
isr = NETISR_IPV6;
break;
#endif
case AF_LINK:
n = sizeof(struct etherip_header) + sizeof(struct ether_header);
if (n > m->m_len) {
m = m_pullup(m, n);
if (m == NULL) {
ifp->if_ierrors++;
return;
}
}
eip = mtod(m, struct etherip_header *);
if (eip->eip_ver !=
(ETHERIP_VERSION & ETHERIP_VER_VERS_MASK)) {
/* discard unknown versions */
m_freem(m);
return;
}
m_adj(m, sizeof(struct etherip_header));
m->m_flags &= ~(M_BCAST|M_MCAST);
m->m_pkthdr.rcvif = ifp;
if (ifp->if_bridge)
BRIDGE_INPUT(ifp, m);
if (m != NULL)
m_freem(m);
return;
default:
if (ng_gif_input_orphan_p != NULL)
(*ng_gif_input_orphan_p)(ifp, m, af);

8
sys/net/if_gif.h
View File

@ -85,6 +85,14 @@ struct gif_softc {
#define MTAG_GIF 1080679712
#define MTAG_GIF_CALLED 0
struct etherip_header {
u_int8_t eip_ver; /* version/reserved */
u_int8_t eip_pad; /* required padding byte */
};
#define ETHERIP_VER_VERS_MASK 0x0f
#define ETHERIP_VER_RSVD_MASK 0xf0
#define ETHERIP_VERSION 0x03
/* Prototypes */
void gifattach0(struct gif_softc *);
void gif_input(struct mbuf *, int, struct ifnet *);

19
sys/netinet/in_gif.c
View File

@ -100,6 +100,7 @@ in_gif_output(ifp, family, m)
struct sockaddr_in *sin_src = (struct sockaddr_in *)sc->gif_psrc;
struct sockaddr_in *sin_dst = (struct sockaddr_in *)sc->gif_pdst;
struct ip iphdr; /* capsule IP header, host byte ordered */
struct etherip_header eiphdr;
int proto, error;
u_int8_t tos;
@ -142,6 +143,20 @@ in_gif_output(ifp, family, m)
break;
}
#endif /* INET6 */
case AF_LINK:
proto = IPPROTO_ETHERIP;
eiphdr.eip_ver = ETHERIP_VERSION & ETHERIP_VER_VERS_MASK;
eiphdr.eip_pad = 0;
/* prepend Ethernet-in-IP header */
M_PREPEND(m, sizeof(struct etherip_header), M_DONTWAIT);
if (m && m->m_len < sizeof(struct etherip_header))
m = m_pullup(m, sizeof(struct etherip_header));
if (m == NULL)
return ENOBUFS;
bcopy(&eiphdr, mtod(m, struct etherip_header *),
sizeof(struct etherip_header));
break;
default:
#ifdef DEBUG
printf("in_gif_output: warning: unknown family %d passed\n",
@ -302,6 +317,10 @@ in_gif_input(m, off)
break;
}
#endif /* INET6 */
case IPPROTO_ETHERIP:
af = AF_LINK;
break;
default:
ipstat.ips_nogif++;
m_freem(m);

10
sys/netinet/in_proto.c
View File

@ -257,6 +257,16 @@ struct protosw inetsw[] = {
.pr_init = encap_init,
.pr_usrreqs = &rip_usrreqs
},
{
.pr_type = SOCK_RAW,
.pr_domain = &inetdomain,
.pr_protocol = IPPROTO_ETHERIP,
.pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR,
.pr_input = encap4_input,
.pr_ctloutput = rip_ctloutput,
.pr_init = encap_init,
.pr_usrreqs = &rip_usrreqs
},
{
.pr_type = SOCK_RAW,
.pr_domain = &inetdomain,

19
sys/netinet6/in6_gif.c
View File

@ -93,6 +93,7 @@ in6_gif_output(ifp, family, m)
struct sockaddr_in6 *sin6_src = (struct sockaddr_in6 *)sc->gif_psrc;
struct sockaddr_in6 *sin6_dst = (struct sockaddr_in6 *)sc->gif_pdst;
struct ip6_hdr *ip6;
struct etherip_header eiphdr;
int proto, error;
u_int8_t itos, otos;
@ -135,6 +136,20 @@ in6_gif_output(ifp, family, m)
break;
}
#endif
case AF_LINK:
proto = IPPROTO_ETHERIP;
eiphdr.eip_ver = ETHERIP_VERSION & ETHERIP_VER_VERS_MASK;
eiphdr.eip_pad = 0;
/* prepend Ethernet-in-IP header */
M_PREPEND(m, sizeof(struct etherip_header), M_DONTWAIT);
if (m && m->m_len < sizeof(struct etherip_header))
m = m_pullup(m, sizeof(struct etherip_header));
if (m == NULL)
return ENOBUFS;
bcopy(&eiphdr, mtod(m, struct etherip_header *),
sizeof(struct etherip_header));
break;
default:
#ifdef DEBUG
printf("in6_gif_output: warning: unknown family %d passed\n",
@ -301,6 +316,10 @@ in6_gif_input(mp, offp, proto)
break;
}
#endif
case IPPROTO_ETHERIP:
af = AF_LINK;
break;
default:
ip6stat.ip6s_nogif++;
m_freem(m);