Initial import

Code is based on FreeBSD 8.2 with USB support from Sebastian Huber
and Thomas Doerfler. Initial TCP/IP stack work is from Kevel Kirspel.

1 files changed, 469 insertions, 0 deletions

diff --git a/rtems/freebsd/netinet/in_gif.c b/rtems/freebsd/netinet/in_gif.c
new file mode 100644
index 00000000..6b9d8508
--- /dev/null
+++ b/rtems/freebsd/netinet/in_gif.c
@@ -0,0 +1,469 @@
+#include <rtems/freebsd/machine/rtems-bsd-config.h>
+
+/*	$KAME: in_gif.c,v 1.54 2001/05/14 14:02:16 itojun Exp $	*/
+
+/*-
+ * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
+ * 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 project 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 PROJECT 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 PROJECT 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.
+ */
+
+#include <rtems/freebsd/sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <rtems/freebsd/local/opt_mrouting.h>
+#include <rtems/freebsd/local/opt_inet.h>
+#include <rtems/freebsd/local/opt_inet6.h>
+
+#include <rtems/freebsd/sys/param.h>
+#include <rtems/freebsd/sys/systm.h>
+#include <rtems/freebsd/sys/socket.h>
+#include <rtems/freebsd/sys/sockio.h>
+#include <rtems/freebsd/sys/mbuf.h>
+#include <rtems/freebsd/sys/errno.h>
+#include <rtems/freebsd/sys/kernel.h>
+#include <rtems/freebsd/sys/sysctl.h>
+#include <rtems/freebsd/sys/protosw.h>
+#include <rtems/freebsd/sys/malloc.h>
+
+#include <rtems/freebsd/net/if.h>
+#include <rtems/freebsd/net/route.h>
+#include <rtems/freebsd/net/vnet.h>
+
+#include <rtems/freebsd/netinet/in.h>
+#include <rtems/freebsd/netinet/in_systm.h>
+#include <rtems/freebsd/netinet/ip.h>
+#include <rtems/freebsd/netinet/ip_var.h>
+#include <rtems/freebsd/netinet/in_gif.h>
+#include <rtems/freebsd/netinet/in_var.h>
+#include <rtems/freebsd/netinet/ip_encap.h>
+#include <rtems/freebsd/netinet/ip_ecn.h>
+
+#ifdef INET6
+#include <rtems/freebsd/netinet/ip6.h>
+#endif
+
+#ifdef MROUTING
+#include <rtems/freebsd/netinet/ip_mroute.h>
+#endif /* MROUTING */
+
+#include <rtems/freebsd/net/if_gif.h>	
+
+static int gif_validate4(const struct ip *, struct gif_softc *,
+	struct ifnet *);
+
+extern  struct domain inetdomain;
+struct protosw in_gif_protosw = {
+	.pr_type =		SOCK_RAW,
+	.pr_domain =		&inetdomain,
+	.pr_protocol =		0/* IPPROTO_IPV[46] */,
+	.pr_flags =		PR_ATOMIC|PR_ADDR,
+	.pr_input =		in_gif_input,
+	.pr_output =		(pr_output_t*)rip_output,
+	.pr_ctloutput =		rip_ctloutput,
+	.pr_usrreqs =		&rip_usrreqs
+};
+
+VNET_DEFINE(int, ip_gif_ttl) = GIF_TTL;
+#define	V_ip_gif_ttl		VNET(ip_gif_ttl)
+SYSCTL_VNET_INT(_net_inet_ip, IPCTL_GIF_TTL, gifttl, CTLFLAG_RW,
+	&VNET_NAME(ip_gif_ttl), 0, "");
+
+int
+in_gif_output(struct ifnet *ifp, int family, struct mbuf *m)
+{
+	struct gif_softc *sc = ifp->if_softc;
+	struct sockaddr_in *dst = (struct sockaddr_in *)&sc->gif_ro.ro_dst;
+	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 error, len, proto;
+	u_int8_t tos;
+
+	GIF_LOCK_ASSERT(sc);
+
+	if (sin_src == NULL || sin_dst == NULL ||
+	    sin_src->sin_family != AF_INET ||
+	    sin_dst->sin_family != AF_INET) {
+		m_freem(m);
+		return EAFNOSUPPORT;
+	}
+
+	switch (family) {
+#ifdef INET
+	case AF_INET:
+	    {
+		struct ip *ip;
+
+		proto = IPPROTO_IPV4;
+		if (m->m_len < sizeof(*ip)) {
+			m = m_pullup(m, sizeof(*ip));
+			if (!m)
+				return ENOBUFS;
+		}
+		ip = mtod(m, struct ip *);
+		tos = ip->ip_tos;
+		break;
+	    }
+#endif /* INET */
+#ifdef INET6
+	case AF_INET6:
+	    {
+		struct ip6_hdr *ip6;
+		proto = IPPROTO_IPV6;
+		if (m->m_len < sizeof(*ip6)) {
+			m = m_pullup(m, sizeof(*ip6));
+			if (!m)
+				return ENOBUFS;
+		}
+		ip6 = mtod(m, struct ip6_hdr *);
+		tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
+		break;
+	    }
+#endif /* INET6 */
+	case AF_LINK:
+ 		proto = IPPROTO_ETHERIP;
+
+		/*
+		 * GIF_SEND_REVETHIP (disabled by default) intentionally
+		 * sends an EtherIP packet with revered version field in
+		 * the header.  This is a knob for backward compatibility
+		 * with FreeBSD 7.2R or prior.
+		 */
+		if ((sc->gif_options & GIF_SEND_REVETHIP)) {
+ 			eiphdr.eip_ver = 0;
+ 			eiphdr.eip_resvl = ETHERIP_VERSION;
+ 			eiphdr.eip_resvh = 0;
+		} else {
+ 			eiphdr.eip_ver = ETHERIP_VERSION;
+ 			eiphdr.eip_resvl = 0;
+ 			eiphdr.eip_resvh = 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",
+			family);
+#endif
+		m_freem(m);
+		return EAFNOSUPPORT;
+	}
+
+	bzero(&iphdr, sizeof(iphdr));
+	iphdr.ip_src = sin_src->sin_addr;
+	/* bidirectional configured tunnel mode */
+	if (sin_dst->sin_addr.s_addr != INADDR_ANY)
+		iphdr.ip_dst = sin_dst->sin_addr;
+	else {
+		m_freem(m);
+		return ENETUNREACH;
+	}
+	iphdr.ip_p = proto;
+	/* version will be set in ip_output() */
+	iphdr.ip_ttl = V_ip_gif_ttl;
+	iphdr.ip_len = m->m_pkthdr.len + sizeof(struct ip);
+	ip_ecn_ingress((ifp->if_flags & IFF_LINK1) ? ECN_ALLOWED : ECN_NOCARE,
+		       &iphdr.ip_tos, &tos);
+
+	/* prepend new IP header */
+	len = sizeof(struct ip);
+#ifndef __NO_STRICT_ALIGNMENT
+	if (family == AF_LINK)
+		len += ETHERIP_ALIGN;
+#endif
+	M_PREPEND(m, len, M_DONTWAIT);
+	if (m != NULL && m->m_len < len)
+		m = m_pullup(m, len);
+	if (m == NULL) {
+		printf("ENOBUFS in in_gif_output %d\n", __LINE__);
+		return ENOBUFS;
+	}
+#ifndef __NO_STRICT_ALIGNMENT
+	if (family == AF_LINK) {
+		len = mtod(m, vm_offset_t) & 3;
+		KASSERT(len == 0 || len == ETHERIP_ALIGN,
+		    ("in_gif_output: unexpected misalignment"));
+		m->m_data += len;
+		m->m_len -= ETHERIP_ALIGN;
+	}
+#endif
+	bcopy(&iphdr, mtod(m, struct ip *), sizeof(struct ip));
+
+	M_SETFIB(m, sc->gif_fibnum);
+
+	if (dst->sin_family != sin_dst->sin_family ||
+	    dst->sin_addr.s_addr != sin_dst->sin_addr.s_addr) {
+		/* cache route doesn't match */
+		bzero(dst, sizeof(*dst));
+		dst->sin_family = sin_dst->sin_family;
+		dst->sin_len = sizeof(struct sockaddr_in);
+		dst->sin_addr = sin_dst->sin_addr;
+		if (sc->gif_ro.ro_rt) {
+			RTFREE(sc->gif_ro.ro_rt);
+			sc->gif_ro.ro_rt = NULL;
+		}
+#if 0
+		GIF2IFP(sc)->if_mtu = GIF_MTU;
+#endif
+	}
+
+	if (sc->gif_ro.ro_rt == NULL) {
+		in_rtalloc_ign(&sc->gif_ro, 0, sc->gif_fibnum);
+		if (sc->gif_ro.ro_rt == NULL) {
+			m_freem(m);
+			return ENETUNREACH;
+		}
+
+		/* if it constitutes infinite encapsulation, punt. */
+		if (sc->gif_ro.ro_rt->rt_ifp == ifp) {
+			m_freem(m);
+			return ENETUNREACH;	/* XXX */
+		}
+#if 0
+		ifp->if_mtu = sc->gif_ro.ro_rt->rt_ifp->if_mtu
+			- sizeof(struct ip);
+#endif
+	}
+
+	error = ip_output(m, NULL, &sc->gif_ro, 0, NULL, NULL);
+
+	if (!(GIF2IFP(sc)->if_flags & IFF_LINK0) &&
+	    sc->gif_ro.ro_rt != NULL) {
+		RTFREE(sc->gif_ro.ro_rt);
+		sc->gif_ro.ro_rt = NULL;
+	}
+
+	return (error);
+}
+
+void
+in_gif_input(struct mbuf *m, int off)
+{
+	struct ifnet *gifp = NULL;
+	struct gif_softc *sc;
+	struct ip *ip;
+	int af;
+	u_int8_t otos;
+	int proto;
+
+	ip = mtod(m, struct ip *);
+	proto = ip->ip_p;
+
+	sc = (struct gif_softc *)encap_getarg(m);
+	if (sc == NULL) {
+		m_freem(m);
+		KMOD_IPSTAT_INC(ips_nogif);
+		return;
+	}
+
+	gifp = GIF2IFP(sc);
+	if (gifp == NULL || (gifp->if_flags & IFF_UP) == 0) {
+		m_freem(m);
+		KMOD_IPSTAT_INC(ips_nogif);
+		return;
+	}
+
+	otos = ip->ip_tos;
+	m_adj(m, off);
+
+	switch (proto) {
+#ifdef INET
+	case IPPROTO_IPV4:
+	    {
+		struct ip *ip;
+		af = AF_INET;
+		if (m->m_len < sizeof(*ip)) {
+			m = m_pullup(m, sizeof(*ip));
+			if (!m)
+				return;
+		}
+		ip = mtod(m, struct ip *);
+		if (ip_ecn_egress((gifp->if_flags & IFF_LINK1) ?
+				  ECN_ALLOWED : ECN_NOCARE,
+				  &otos, &ip->ip_tos) == 0) {
+			m_freem(m);
+			return;
+		}
+		break;
+	    }
+#endif
+#ifdef INET6
+	case IPPROTO_IPV6:
+	    {
+		struct ip6_hdr *ip6;
+		u_int8_t itos, oitos;
+
+		af = AF_INET6;
+		if (m->m_len < sizeof(*ip6)) {
+			m = m_pullup(m, sizeof(*ip6));
+			if (!m)
+				return;
+		}
+		ip6 = mtod(m, struct ip6_hdr *);
+		itos = oitos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
+		if (ip_ecn_egress((gifp->if_flags & IFF_LINK1) ?
+				  ECN_ALLOWED : ECN_NOCARE,
+				  &otos, &itos) == 0) {
+			m_freem(m);
+			return;
+		}
+		if (itos != oitos) {
+			ip6->ip6_flow &= ~htonl(0xff << 20);
+			ip6->ip6_flow |= htonl((u_int32_t)itos << 20);
+		}
+		break;
+	    }
+#endif /* INET6 */
+ 	case IPPROTO_ETHERIP:
+ 		af = AF_LINK;
+ 		break;	
+
+	default:
+		KMOD_IPSTAT_INC(ips_nogif);
+		m_freem(m);
+		return;
+	}
+	gif_input(m, af, gifp);
+	return;
+}
+
+/*
+ * validate outer address.
+ */
+static int
+gif_validate4(const struct ip *ip, struct gif_softc *sc, struct ifnet *ifp)
+{
+	struct sockaddr_in *src, *dst;
+	struct in_ifaddr *ia4;
+
+	src = (struct sockaddr_in *)sc->gif_psrc;
+	dst = (struct sockaddr_in *)sc->gif_pdst;
+
+	/* check for address match */
+	if (src->sin_addr.s_addr != ip->ip_dst.s_addr ||
+	    dst->sin_addr.s_addr != ip->ip_src.s_addr)
+		return 0;
+
+	/* martian filters on outer source - NOT done in ip_input! */
+	if (IN_MULTICAST(ntohl(ip->ip_src.s_addr)))
+		return 0;
+	switch ((ntohl(ip->ip_src.s_addr) & 0xff000000) >> 24) {
+	case 0: case 127: case 255:
+		return 0;
+	}
+
+	/* reject packets with broadcast on source */
+	/* XXXRW: should use hash lists? */
+	IN_IFADDR_RLOCK();
+	TAILQ_FOREACH(ia4, &V_in_ifaddrhead, ia_link) {
+		if ((ia4->ia_ifa.ifa_ifp->if_flags & IFF_BROADCAST) == 0)
+			continue;
+		if (ip->ip_src.s_addr == ia4->ia_broadaddr.sin_addr.s_addr) {
+			IN_IFADDR_RUNLOCK();
+			return 0;
+		}
+	}
+	IN_IFADDR_RUNLOCK();
+
+	/* ingress filters on outer source */
+	if ((GIF2IFP(sc)->if_flags & IFF_LINK2) == 0 && ifp) {
+		struct sockaddr_in sin;
+		struct rtentry *rt;
+
+		bzero(&sin, sizeof(sin));
+		sin.sin_family = AF_INET;
+		sin.sin_len = sizeof(struct sockaddr_in);
+		sin.sin_addr = ip->ip_src;
+		/* XXX MRT  check for the interface we would use on output */
+		rt = in_rtalloc1((struct sockaddr *)&sin, 0,
+		    0UL, sc->gif_fibnum);
+		if (!rt || rt->rt_ifp != ifp) {
+#if 0
+			log(LOG_WARNING, "%s: packet from 0x%x dropped "
+			    "due to ingress filter\n", if_name(GIF2IFP(sc)),
+			    (u_int32_t)ntohl(sin.sin_addr.s_addr));
+#endif
+			if (rt)
+				RTFREE_LOCKED(rt);
+			return 0;
+		}
+		RTFREE_LOCKED(rt);
+	}
+
+	return 32 * 2;
+}
+
+/*
+ * we know that we are in IFF_UP, outer address available, and outer family
+ * matched the physical addr family.  see gif_encapcheck().
+ */
+int
+gif_encapcheck4(const struct mbuf *m, int off, int proto, void *arg)
+{
+	struct ip ip;
+	struct gif_softc *sc;
+	struct ifnet *ifp;
+
+	/* sanity check done in caller */
+	sc = (struct gif_softc *)arg;
+
+	/* LINTED const cast */
+	m_copydata(m, 0, sizeof(ip), (caddr_t)&ip);
+	ifp = ((m->m_flags & M_PKTHDR) != 0) ? m->m_pkthdr.rcvif : NULL;
+
+	return gif_validate4(&ip, sc, ifp);
+}
+
+int
+in_gif_attach(struct gif_softc *sc)
+{
+	sc->encap_cookie4 = encap_attach_func(AF_INET, -1, gif_encapcheck,
+	    &in_gif_protosw, sc);
+	if (sc->encap_cookie4 == NULL)
+		return EEXIST;
+	return 0;
+}
+
+int
+in_gif_detach(struct gif_softc *sc)
+{
+	int error;
+
+	error = encap_detach(sc->encap_cookie4);
+	if (error == 0)
+		sc->encap_cookie4 = NULL;
+	return error;
+}