3b39d8bc17
extremely outdated, and I doubt that it was ever used for ifnet drivers. It was used for AF_INET sockets in pre-FreeBSD time. Approved by: re (hrs) Sponsored by: Nginx, Inc.
979 lines
24 KiB
C
979 lines
24 KiB
C
/* $NetBSD: if_gre.c,v 1.49 2003/12/11 00:22:29 itojun Exp $ */
|
|
/* $FreeBSD$ */
|
|
|
|
/*-
|
|
* Copyright (c) 1998 The NetBSD Foundation, Inc.
|
|
* All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to The NetBSD Foundation
|
|
* by Heiko W.Rupp <hwr@pilhuhn.de>
|
|
*
|
|
* IPv6-over-GRE contributed by Gert Doering <gert@greenie.muc.de>
|
|
*
|
|
* 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.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
|
|
*/
|
|
|
|
/*
|
|
* Encapsulate L3 protocols into IP
|
|
* See RFC 2784 (successor of RFC 1701 and 1702) for more details.
|
|
* If_gre is compatible with Cisco GRE tunnels, so you can
|
|
* have a NetBSD box as the other end of a tunnel interface of a Cisco
|
|
* router. See gre(4) for more details.
|
|
* Also supported: IP in IP encaps (proto 55) as of RFC 2004
|
|
*/
|
|
|
|
#include "opt_atalk.h"
|
|
#include "opt_inet.h"
|
|
#include "opt_inet6.h"
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/jail.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/libkern.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/module.h>
|
|
#include <sys/mbuf.h>
|
|
#include <sys/priv.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/protosw.h>
|
|
#include <sys/socket.h>
|
|
#include <sys/sockio.h>
|
|
#include <sys/sysctl.h>
|
|
#include <sys/systm.h>
|
|
|
|
#include <net/ethernet.h>
|
|
#include <net/if.h>
|
|
#include <net/if_clone.h>
|
|
#include <net/if_types.h>
|
|
#include <net/route.h>
|
|
#include <net/vnet.h>
|
|
|
|
#ifdef INET
|
|
#include <netinet/in.h>
|
|
#include <netinet/in_systm.h>
|
|
#include <netinet/in_var.h>
|
|
#include <netinet/ip.h>
|
|
#include <netinet/ip_gre.h>
|
|
#include <netinet/ip_var.h>
|
|
#include <netinet/ip_encap.h>
|
|
#else
|
|
#error "Huh? if_gre without inet?"
|
|
#endif
|
|
|
|
#include <net/bpf.h>
|
|
|
|
#include <net/if_gre.h>
|
|
|
|
/*
|
|
* It is not easy to calculate the right value for a GRE MTU.
|
|
* We leave this task to the admin and use the same default that
|
|
* other vendors use.
|
|
*/
|
|
#define GREMTU 1476
|
|
|
|
#define MTAG_COOKIE_GRE 1307983903
|
|
#define MTAG_GRE_NESTING 1
|
|
struct mtag_gre_nesting {
|
|
uint16_t count;
|
|
uint16_t max;
|
|
struct ifnet *ifp[];
|
|
};
|
|
|
|
/*
|
|
* gre_mtx protects all global variables in if_gre.c.
|
|
* XXX: gre_softc data not protected yet.
|
|
*/
|
|
struct mtx gre_mtx;
|
|
static const char grename[] = "gre";
|
|
static MALLOC_DEFINE(M_GRE, grename, "Generic Routing Encapsulation");
|
|
|
|
struct gre_softc_head gre_softc_list;
|
|
|
|
static int gre_clone_create(struct if_clone *, int, caddr_t);
|
|
static void gre_clone_destroy(struct ifnet *);
|
|
static struct if_clone *gre_cloner;
|
|
|
|
static int gre_ioctl(struct ifnet *, u_long, caddr_t);
|
|
static int gre_output(struct ifnet *, struct mbuf *,
|
|
const struct sockaddr *, struct route *);
|
|
|
|
static int gre_compute_route(struct gre_softc *sc);
|
|
|
|
static void greattach(void);
|
|
|
|
#ifdef INET
|
|
extern struct domain inetdomain;
|
|
static const struct protosw in_gre_protosw = {
|
|
.pr_type = SOCK_RAW,
|
|
.pr_domain = &inetdomain,
|
|
.pr_protocol = IPPROTO_GRE,
|
|
.pr_flags = PR_ATOMIC|PR_ADDR,
|
|
.pr_input = gre_input,
|
|
.pr_output = (pr_output_t *)rip_output,
|
|
.pr_ctlinput = rip_ctlinput,
|
|
.pr_ctloutput = rip_ctloutput,
|
|
.pr_usrreqs = &rip_usrreqs
|
|
};
|
|
static const struct protosw in_mobile_protosw = {
|
|
.pr_type = SOCK_RAW,
|
|
.pr_domain = &inetdomain,
|
|
.pr_protocol = IPPROTO_MOBILE,
|
|
.pr_flags = PR_ATOMIC|PR_ADDR,
|
|
.pr_input = gre_mobile_input,
|
|
.pr_output = (pr_output_t *)rip_output,
|
|
.pr_ctlinput = rip_ctlinput,
|
|
.pr_ctloutput = rip_ctloutput,
|
|
.pr_usrreqs = &rip_usrreqs
|
|
};
|
|
#endif
|
|
|
|
SYSCTL_DECL(_net_link);
|
|
static SYSCTL_NODE(_net_link, IFT_TUNNEL, gre, CTLFLAG_RW, 0,
|
|
"Generic Routing Encapsulation");
|
|
#ifndef MAX_GRE_NEST
|
|
/*
|
|
* This macro controls the default upper limitation on nesting of gre tunnels.
|
|
* Since, setting a large value to this macro with a careless configuration
|
|
* may introduce system crash, we don't allow any nestings by default.
|
|
* If you need to configure nested gre tunnels, you can define this macro
|
|
* in your kernel configuration file. However, if you do so, please be
|
|
* careful to configure the tunnels so that it won't make a loop.
|
|
*/
|
|
#define MAX_GRE_NEST 1
|
|
#endif
|
|
static int max_gre_nesting = MAX_GRE_NEST;
|
|
SYSCTL_INT(_net_link_gre, OID_AUTO, max_nesting, CTLFLAG_RW,
|
|
&max_gre_nesting, 0, "Max nested tunnels");
|
|
|
|
/* ARGSUSED */
|
|
static void
|
|
greattach(void)
|
|
{
|
|
|
|
mtx_init(&gre_mtx, "gre_mtx", NULL, MTX_DEF);
|
|
LIST_INIT(&gre_softc_list);
|
|
gre_cloner = if_clone_simple(grename, gre_clone_create,
|
|
gre_clone_destroy, 0);
|
|
}
|
|
|
|
static int
|
|
gre_clone_create(ifc, unit, params)
|
|
struct if_clone *ifc;
|
|
int unit;
|
|
caddr_t params;
|
|
{
|
|
struct gre_softc *sc;
|
|
|
|
sc = malloc(sizeof(struct gre_softc), M_GRE, M_WAITOK | M_ZERO);
|
|
|
|
GRE2IFP(sc) = if_alloc(IFT_TUNNEL);
|
|
if (GRE2IFP(sc) == NULL) {
|
|
free(sc, M_GRE);
|
|
return (ENOSPC);
|
|
}
|
|
|
|
GRE2IFP(sc)->if_softc = sc;
|
|
if_initname(GRE2IFP(sc), grename, unit);
|
|
|
|
GRE2IFP(sc)->if_snd.ifq_maxlen = ifqmaxlen;
|
|
GRE2IFP(sc)->if_addrlen = 0;
|
|
GRE2IFP(sc)->if_hdrlen = 24; /* IP + GRE */
|
|
GRE2IFP(sc)->if_mtu = GREMTU;
|
|
GRE2IFP(sc)->if_flags = IFF_POINTOPOINT|IFF_MULTICAST;
|
|
GRE2IFP(sc)->if_output = gre_output;
|
|
GRE2IFP(sc)->if_ioctl = gre_ioctl;
|
|
sc->g_dst.s_addr = sc->g_src.s_addr = INADDR_ANY;
|
|
sc->g_proto = IPPROTO_GRE;
|
|
GRE2IFP(sc)->if_flags |= IFF_LINK0;
|
|
sc->encap = NULL;
|
|
sc->gre_fibnum = curthread->td_proc->p_fibnum;
|
|
sc->wccp_ver = WCCP_V1;
|
|
sc->key = 0;
|
|
if_attach(GRE2IFP(sc));
|
|
bpfattach(GRE2IFP(sc), DLT_NULL, sizeof(u_int32_t));
|
|
mtx_lock(&gre_mtx);
|
|
LIST_INSERT_HEAD(&gre_softc_list, sc, sc_list);
|
|
mtx_unlock(&gre_mtx);
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
gre_clone_destroy(ifp)
|
|
struct ifnet *ifp;
|
|
{
|
|
struct gre_softc *sc = ifp->if_softc;
|
|
|
|
mtx_lock(&gre_mtx);
|
|
LIST_REMOVE(sc, sc_list);
|
|
mtx_unlock(&gre_mtx);
|
|
|
|
#ifdef INET
|
|
if (sc->encap != NULL)
|
|
encap_detach(sc->encap);
|
|
#endif
|
|
bpfdetach(ifp);
|
|
if_detach(ifp);
|
|
if_free(ifp);
|
|
free(sc, M_GRE);
|
|
}
|
|
|
|
/*
|
|
* The output routine. Takes a packet and encapsulates it in the protocol
|
|
* given by sc->g_proto. See also RFC 1701 and RFC 2004
|
|
*/
|
|
static int
|
|
gre_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst,
|
|
struct route *ro)
|
|
{
|
|
int error = 0;
|
|
struct gre_softc *sc = ifp->if_softc;
|
|
struct greip *gh;
|
|
struct ip *ip;
|
|
struct m_tag *mtag;
|
|
struct mtag_gre_nesting *gt;
|
|
size_t len;
|
|
u_short gre_ip_id = 0;
|
|
uint8_t gre_ip_tos = 0;
|
|
u_int16_t etype = 0;
|
|
struct mobile_h mob_h;
|
|
u_int32_t af;
|
|
int extra = 0, max;
|
|
|
|
/*
|
|
* gre may cause infinite recursion calls when misconfigured. High
|
|
* nesting level may cause stack exhaustion. We'll prevent this by
|
|
* detecting loops and by introducing upper limit.
|
|
*/
|
|
mtag = m_tag_locate(m, MTAG_COOKIE_GRE, MTAG_GRE_NESTING, NULL);
|
|
if (mtag != NULL) {
|
|
struct ifnet **ifp2;
|
|
|
|
gt = (struct mtag_gre_nesting *)(mtag + 1);
|
|
gt->count++;
|
|
if (gt->count > min(gt->max,max_gre_nesting)) {
|
|
printf("%s: hit maximum recursion limit %u on %s\n",
|
|
__func__, gt->count - 1, ifp->if_xname);
|
|
m_freem(m);
|
|
error = EIO; /* is there better errno? */
|
|
goto end;
|
|
}
|
|
|
|
ifp2 = gt->ifp;
|
|
for (max = gt->count - 1; max > 0; max--) {
|
|
if (*ifp2 == ifp)
|
|
break;
|
|
ifp2++;
|
|
}
|
|
if (*ifp2 == ifp) {
|
|
printf("%s: detected loop with nexting %u on %s\n",
|
|
__func__, gt->count-1, ifp->if_xname);
|
|
m_freem(m);
|
|
error = EIO; /* is there better errno? */
|
|
goto end;
|
|
}
|
|
*ifp2 = ifp;
|
|
|
|
} else {
|
|
/*
|
|
* Given that people should NOT increase max_gre_nesting beyond
|
|
* their real needs, we allocate once per packet rather than
|
|
* allocating an mtag once per passing through gre.
|
|
*
|
|
* Note: the sysctl does not actually check for saneness, so we
|
|
* limit the maximum numbers of possible recursions here.
|
|
*/
|
|
max = imin(max_gre_nesting, 256);
|
|
/* If someone sets the sysctl <= 0, we want at least 1. */
|
|
max = imax(max, 1);
|
|
len = sizeof(struct mtag_gre_nesting) +
|
|
max * sizeof(struct ifnet *);
|
|
mtag = m_tag_alloc(MTAG_COOKIE_GRE, MTAG_GRE_NESTING, len,
|
|
M_NOWAIT);
|
|
if (mtag == NULL) {
|
|
m_freem(m);
|
|
error = ENOMEM;
|
|
goto end;
|
|
}
|
|
gt = (struct mtag_gre_nesting *)(mtag + 1);
|
|
bzero(gt, len);
|
|
gt->count = 1;
|
|
gt->max = max;
|
|
*gt->ifp = ifp;
|
|
m_tag_prepend(m, mtag);
|
|
}
|
|
|
|
if (!((ifp->if_flags & IFF_UP) &&
|
|
(ifp->if_drv_flags & IFF_DRV_RUNNING)) ||
|
|
sc->g_src.s_addr == INADDR_ANY || sc->g_dst.s_addr == INADDR_ANY) {
|
|
m_freem(m);
|
|
error = ENETDOWN;
|
|
goto end;
|
|
}
|
|
|
|
gh = NULL;
|
|
ip = NULL;
|
|
|
|
/* BPF writes need to be handled specially. */
|
|
if (dst->sa_family == AF_UNSPEC)
|
|
bcopy(dst->sa_data, &af, sizeof(af));
|
|
else
|
|
af = dst->sa_family;
|
|
|
|
if (bpf_peers_present(ifp->if_bpf))
|
|
bpf_mtap2(ifp->if_bpf, &af, sizeof(af), m);
|
|
|
|
if ((ifp->if_flags & IFF_MONITOR) != 0) {
|
|
m_freem(m);
|
|
error = ENETDOWN;
|
|
goto end;
|
|
}
|
|
|
|
m->m_flags &= ~(M_BCAST|M_MCAST);
|
|
|
|
if (sc->g_proto == IPPROTO_MOBILE) {
|
|
if (af == AF_INET) {
|
|
struct mbuf *m0;
|
|
int msiz;
|
|
|
|
ip = mtod(m, struct ip *);
|
|
|
|
/*
|
|
* RFC2004 specifies that fragmented diagrams shouldn't
|
|
* be encapsulated.
|
|
*/
|
|
if (ip->ip_off & htons(IP_MF | IP_OFFMASK)) {
|
|
_IF_DROP(&ifp->if_snd);
|
|
m_freem(m);
|
|
error = EINVAL; /* is there better errno? */
|
|
goto end;
|
|
}
|
|
memset(&mob_h, 0, MOB_H_SIZ_L);
|
|
mob_h.proto = (ip->ip_p) << 8;
|
|
mob_h.odst = ip->ip_dst.s_addr;
|
|
ip->ip_dst.s_addr = sc->g_dst.s_addr;
|
|
|
|
/*
|
|
* If the packet comes from our host, we only change
|
|
* the destination address in the IP header.
|
|
* Else we also need to save and change the source
|
|
*/
|
|
if (in_hosteq(ip->ip_src, sc->g_src)) {
|
|
msiz = MOB_H_SIZ_S;
|
|
} else {
|
|
mob_h.proto |= MOB_H_SBIT;
|
|
mob_h.osrc = ip->ip_src.s_addr;
|
|
ip->ip_src.s_addr = sc->g_src.s_addr;
|
|
msiz = MOB_H_SIZ_L;
|
|
}
|
|
mob_h.proto = htons(mob_h.proto);
|
|
mob_h.hcrc = gre_in_cksum((u_int16_t *)&mob_h, msiz);
|
|
|
|
if ((m->m_data - msiz) < m->m_pktdat) {
|
|
m0 = m_gethdr(M_NOWAIT, MT_DATA);
|
|
if (m0 == NULL) {
|
|
_IF_DROP(&ifp->if_snd);
|
|
m_freem(m);
|
|
error = ENOBUFS;
|
|
goto end;
|
|
}
|
|
m0->m_next = m;
|
|
m->m_data += sizeof(struct ip);
|
|
m->m_len -= sizeof(struct ip);
|
|
m0->m_pkthdr.len = m->m_pkthdr.len + msiz;
|
|
m0->m_len = msiz + sizeof(struct ip);
|
|
m0->m_data += max_linkhdr;
|
|
memcpy(mtod(m0, caddr_t), (caddr_t)ip,
|
|
sizeof(struct ip));
|
|
m = m0;
|
|
} else { /* we have some space left in the old one */
|
|
m->m_data -= msiz;
|
|
m->m_len += msiz;
|
|
m->m_pkthdr.len += msiz;
|
|
bcopy(ip, mtod(m, caddr_t),
|
|
sizeof(struct ip));
|
|
}
|
|
ip = mtod(m, struct ip *);
|
|
memcpy((caddr_t)(ip + 1), &mob_h, (unsigned)msiz);
|
|
ip->ip_len = htons(ntohs(ip->ip_len) + msiz);
|
|
} else { /* AF_INET */
|
|
_IF_DROP(&ifp->if_snd);
|
|
m_freem(m);
|
|
error = EINVAL;
|
|
goto end;
|
|
}
|
|
} else if (sc->g_proto == IPPROTO_GRE) {
|
|
switch (af) {
|
|
case AF_INET:
|
|
ip = mtod(m, struct ip *);
|
|
gre_ip_tos = ip->ip_tos;
|
|
gre_ip_id = ip->ip_id;
|
|
if (sc->wccp_ver == WCCP_V2) {
|
|
extra = sizeof(uint32_t);
|
|
etype = WCCP_PROTOCOL_TYPE;
|
|
} else {
|
|
etype = ETHERTYPE_IP;
|
|
}
|
|
break;
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
gre_ip_id = ip_newid();
|
|
etype = ETHERTYPE_IPV6;
|
|
break;
|
|
#endif
|
|
#ifdef NETATALK
|
|
case AF_APPLETALK:
|
|
etype = ETHERTYPE_ATALK;
|
|
break;
|
|
#endif
|
|
default:
|
|
_IF_DROP(&ifp->if_snd);
|
|
m_freem(m);
|
|
error = EAFNOSUPPORT;
|
|
goto end;
|
|
}
|
|
|
|
/* Reserve space for GRE header + optional GRE key */
|
|
int hdrlen = sizeof(struct greip) + extra;
|
|
if (sc->key)
|
|
hdrlen += sizeof(uint32_t);
|
|
M_PREPEND(m, hdrlen, M_NOWAIT);
|
|
} else {
|
|
_IF_DROP(&ifp->if_snd);
|
|
m_freem(m);
|
|
error = EINVAL;
|
|
goto end;
|
|
}
|
|
|
|
if (m == NULL) { /* mbuf allocation failed */
|
|
_IF_DROP(&ifp->if_snd);
|
|
error = ENOBUFS;
|
|
goto end;
|
|
}
|
|
|
|
M_SETFIB(m, sc->gre_fibnum); /* The envelope may use a different FIB */
|
|
|
|
gh = mtod(m, struct greip *);
|
|
if (sc->g_proto == IPPROTO_GRE) {
|
|
uint32_t *options = gh->gi_options;
|
|
|
|
memset((void *)gh, 0, sizeof(struct greip) + extra);
|
|
gh->gi_ptype = htons(etype);
|
|
gh->gi_flags = 0;
|
|
|
|
/* Add key option */
|
|
if (sc->key)
|
|
{
|
|
gh->gi_flags |= htons(GRE_KP);
|
|
*(options++) = htonl(sc->key);
|
|
}
|
|
}
|
|
|
|
gh->gi_pr = sc->g_proto;
|
|
if (sc->g_proto != IPPROTO_MOBILE) {
|
|
gh->gi_src = sc->g_src;
|
|
gh->gi_dst = sc->g_dst;
|
|
((struct ip*)gh)->ip_v = IPPROTO_IPV4;
|
|
((struct ip*)gh)->ip_hl = (sizeof(struct ip)) >> 2;
|
|
((struct ip*)gh)->ip_ttl = GRE_TTL;
|
|
((struct ip*)gh)->ip_tos = gre_ip_tos;
|
|
((struct ip*)gh)->ip_id = gre_ip_id;
|
|
gh->gi_len = htons(m->m_pkthdr.len);
|
|
}
|
|
|
|
ifp->if_opackets++;
|
|
ifp->if_obytes += m->m_pkthdr.len;
|
|
/*
|
|
* Send it off and with IP_FORWARD flag to prevent it from
|
|
* overwriting the ip_id again. ip_id is already set to the
|
|
* ip_id of the encapsulated packet.
|
|
*/
|
|
error = ip_output(m, NULL, &sc->route, IP_FORWARDING,
|
|
(struct ip_moptions *)NULL, (struct inpcb *)NULL);
|
|
end:
|
|
if (error)
|
|
ifp->if_oerrors++;
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
gre_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
|
|
{
|
|
struct ifreq *ifr = (struct ifreq *)data;
|
|
struct if_laddrreq *lifr = (struct if_laddrreq *)data;
|
|
struct in_aliasreq *aifr = (struct in_aliasreq *)data;
|
|
struct gre_softc *sc = ifp->if_softc;
|
|
struct sockaddr_in si;
|
|
struct sockaddr *sa = NULL;
|
|
int error, adj;
|
|
struct sockaddr_in sp, sm, dp, dm;
|
|
uint32_t key;
|
|
|
|
error = 0;
|
|
adj = 0;
|
|
|
|
switch (cmd) {
|
|
case SIOCSIFADDR:
|
|
ifp->if_flags |= IFF_UP;
|
|
break;
|
|
case SIOCSIFFLAGS:
|
|
/*
|
|
* XXXRW: Isn't this priv_check() redundant to the ifnet
|
|
* layer check?
|
|
*/
|
|
if ((error = priv_check(curthread, PRIV_NET_SETIFFLAGS)) != 0)
|
|
break;
|
|
if ((ifr->ifr_flags & IFF_LINK0) != 0)
|
|
sc->g_proto = IPPROTO_GRE;
|
|
else
|
|
sc->g_proto = IPPROTO_MOBILE;
|
|
if ((ifr->ifr_flags & IFF_LINK2) != 0)
|
|
sc->wccp_ver = WCCP_V2;
|
|
else
|
|
sc->wccp_ver = WCCP_V1;
|
|
goto recompute;
|
|
case SIOCSIFMTU:
|
|
/*
|
|
* XXXRW: Isn't this priv_check() redundant to the ifnet
|
|
* layer check?
|
|
*/
|
|
if ((error = priv_check(curthread, PRIV_NET_SETIFMTU)) != 0)
|
|
break;
|
|
if (ifr->ifr_mtu < 576) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
ifp->if_mtu = ifr->ifr_mtu;
|
|
break;
|
|
case SIOCGIFMTU:
|
|
ifr->ifr_mtu = GRE2IFP(sc)->if_mtu;
|
|
break;
|
|
case SIOCADDMULTI:
|
|
/*
|
|
* XXXRW: Isn't this priv_checkr() redundant to the ifnet
|
|
* layer check?
|
|
*/
|
|
if ((error = priv_check(curthread, PRIV_NET_ADDMULTI)) != 0)
|
|
break;
|
|
if (ifr == 0) {
|
|
error = EAFNOSUPPORT;
|
|
break;
|
|
}
|
|
switch (ifr->ifr_addr.sa_family) {
|
|
#ifdef INET
|
|
case AF_INET:
|
|
break;
|
|
#endif
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
break;
|
|
#endif
|
|
default:
|
|
error = EAFNOSUPPORT;
|
|
break;
|
|
}
|
|
break;
|
|
case SIOCDELMULTI:
|
|
/*
|
|
* XXXRW: Isn't this priv_check() redundant to the ifnet
|
|
* layer check?
|
|
*/
|
|
if ((error = priv_check(curthread, PRIV_NET_DELIFGROUP)) != 0)
|
|
break;
|
|
if (ifr == 0) {
|
|
error = EAFNOSUPPORT;
|
|
break;
|
|
}
|
|
switch (ifr->ifr_addr.sa_family) {
|
|
#ifdef INET
|
|
case AF_INET:
|
|
break;
|
|
#endif
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
break;
|
|
#endif
|
|
default:
|
|
error = EAFNOSUPPORT;
|
|
break;
|
|
}
|
|
break;
|
|
case GRESPROTO:
|
|
/*
|
|
* XXXRW: Isn't this priv_check() redundant to the ifnet
|
|
* layer check?
|
|
*/
|
|
if ((error = priv_check(curthread, PRIV_NET_GRE)) != 0)
|
|
break;
|
|
sc->g_proto = ifr->ifr_flags;
|
|
switch (sc->g_proto) {
|
|
case IPPROTO_GRE:
|
|
ifp->if_flags |= IFF_LINK0;
|
|
break;
|
|
case IPPROTO_MOBILE:
|
|
ifp->if_flags &= ~IFF_LINK0;
|
|
break;
|
|
default:
|
|
error = EPROTONOSUPPORT;
|
|
break;
|
|
}
|
|
goto recompute;
|
|
case GREGPROTO:
|
|
ifr->ifr_flags = sc->g_proto;
|
|
break;
|
|
case GRESADDRS:
|
|
case GRESADDRD:
|
|
error = priv_check(curthread, PRIV_NET_GRE);
|
|
if (error)
|
|
return (error);
|
|
/*
|
|
* set tunnel endpoints, compute a less specific route
|
|
* to the remote end and mark if as up
|
|
*/
|
|
sa = &ifr->ifr_addr;
|
|
if (cmd == GRESADDRS)
|
|
sc->g_src = (satosin(sa))->sin_addr;
|
|
if (cmd == GRESADDRD)
|
|
sc->g_dst = (satosin(sa))->sin_addr;
|
|
recompute:
|
|
#ifdef INET
|
|
if (sc->encap != NULL) {
|
|
encap_detach(sc->encap);
|
|
sc->encap = NULL;
|
|
}
|
|
#endif
|
|
if ((sc->g_src.s_addr != INADDR_ANY) &&
|
|
(sc->g_dst.s_addr != INADDR_ANY)) {
|
|
bzero(&sp, sizeof(sp));
|
|
bzero(&sm, sizeof(sm));
|
|
bzero(&dp, sizeof(dp));
|
|
bzero(&dm, sizeof(dm));
|
|
sp.sin_len = sm.sin_len = dp.sin_len = dm.sin_len =
|
|
sizeof(struct sockaddr_in);
|
|
sp.sin_family = sm.sin_family = dp.sin_family =
|
|
dm.sin_family = AF_INET;
|
|
sp.sin_addr = sc->g_src;
|
|
dp.sin_addr = sc->g_dst;
|
|
sm.sin_addr.s_addr = dm.sin_addr.s_addr =
|
|
INADDR_BROADCAST;
|
|
#ifdef INET
|
|
sc->encap = encap_attach(AF_INET, sc->g_proto,
|
|
sintosa(&sp), sintosa(&sm), sintosa(&dp),
|
|
sintosa(&dm), (sc->g_proto == IPPROTO_GRE) ?
|
|
&in_gre_protosw : &in_mobile_protosw, sc);
|
|
if (sc->encap == NULL)
|
|
printf("%s: unable to attach encap\n",
|
|
if_name(GRE2IFP(sc)));
|
|
#endif
|
|
if (sc->route.ro_rt != 0) /* free old route */
|
|
RTFREE(sc->route.ro_rt);
|
|
if (gre_compute_route(sc) == 0)
|
|
ifp->if_drv_flags |= IFF_DRV_RUNNING;
|
|
else
|
|
ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
|
|
}
|
|
break;
|
|
case GREGADDRS:
|
|
memset(&si, 0, sizeof(si));
|
|
si.sin_family = AF_INET;
|
|
si.sin_len = sizeof(struct sockaddr_in);
|
|
si.sin_addr.s_addr = sc->g_src.s_addr;
|
|
sa = sintosa(&si);
|
|
error = prison_if(curthread->td_ucred, sa);
|
|
if (error != 0)
|
|
break;
|
|
ifr->ifr_addr = *sa;
|
|
break;
|
|
case GREGADDRD:
|
|
memset(&si, 0, sizeof(si));
|
|
si.sin_family = AF_INET;
|
|
si.sin_len = sizeof(struct sockaddr_in);
|
|
si.sin_addr.s_addr = sc->g_dst.s_addr;
|
|
sa = sintosa(&si);
|
|
error = prison_if(curthread->td_ucred, sa);
|
|
if (error != 0)
|
|
break;
|
|
ifr->ifr_addr = *sa;
|
|
break;
|
|
case SIOCSIFPHYADDR:
|
|
/*
|
|
* XXXRW: Isn't this priv_check() redundant to the ifnet
|
|
* layer check?
|
|
*/
|
|
if ((error = priv_check(curthread, PRIV_NET_SETIFPHYS)) != 0)
|
|
break;
|
|
if (aifr->ifra_addr.sin_family != AF_INET ||
|
|
aifr->ifra_dstaddr.sin_family != AF_INET) {
|
|
error = EAFNOSUPPORT;
|
|
break;
|
|
}
|
|
if (aifr->ifra_addr.sin_len != sizeof(si) ||
|
|
aifr->ifra_dstaddr.sin_len != sizeof(si)) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
sc->g_src = aifr->ifra_addr.sin_addr;
|
|
sc->g_dst = aifr->ifra_dstaddr.sin_addr;
|
|
goto recompute;
|
|
case SIOCSLIFPHYADDR:
|
|
/*
|
|
* XXXRW: Isn't this priv_check() redundant to the ifnet
|
|
* layer check?
|
|
*/
|
|
if ((error = priv_check(curthread, PRIV_NET_SETIFPHYS)) != 0)
|
|
break;
|
|
if (lifr->addr.ss_family != AF_INET ||
|
|
lifr->dstaddr.ss_family != AF_INET) {
|
|
error = EAFNOSUPPORT;
|
|
break;
|
|
}
|
|
if (lifr->addr.ss_len != sizeof(si) ||
|
|
lifr->dstaddr.ss_len != sizeof(si)) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
sc->g_src = (satosin(&lifr->addr))->sin_addr;
|
|
sc->g_dst =
|
|
(satosin(&lifr->dstaddr))->sin_addr;
|
|
goto recompute;
|
|
case SIOCDIFPHYADDR:
|
|
/*
|
|
* XXXRW: Isn't this priv_check() redundant to the ifnet
|
|
* layer check?
|
|
*/
|
|
if ((error = priv_check(curthread, PRIV_NET_SETIFPHYS)) != 0)
|
|
break;
|
|
sc->g_src.s_addr = INADDR_ANY;
|
|
sc->g_dst.s_addr = INADDR_ANY;
|
|
goto recompute;
|
|
case SIOCGLIFPHYADDR:
|
|
if (sc->g_src.s_addr == INADDR_ANY ||
|
|
sc->g_dst.s_addr == INADDR_ANY) {
|
|
error = EADDRNOTAVAIL;
|
|
break;
|
|
}
|
|
memset(&si, 0, sizeof(si));
|
|
si.sin_family = AF_INET;
|
|
si.sin_len = sizeof(struct sockaddr_in);
|
|
si.sin_addr.s_addr = sc->g_src.s_addr;
|
|
error = prison_if(curthread->td_ucred, (struct sockaddr *)&si);
|
|
if (error != 0)
|
|
break;
|
|
memcpy(&lifr->addr, &si, sizeof(si));
|
|
si.sin_addr.s_addr = sc->g_dst.s_addr;
|
|
error = prison_if(curthread->td_ucred, (struct sockaddr *)&si);
|
|
if (error != 0)
|
|
break;
|
|
memcpy(&lifr->dstaddr, &si, sizeof(si));
|
|
break;
|
|
case SIOCGIFPSRCADDR:
|
|
#ifdef INET6
|
|
case SIOCGIFPSRCADDR_IN6:
|
|
#endif
|
|
if (sc->g_src.s_addr == INADDR_ANY) {
|
|
error = EADDRNOTAVAIL;
|
|
break;
|
|
}
|
|
memset(&si, 0, sizeof(si));
|
|
si.sin_family = AF_INET;
|
|
si.sin_len = sizeof(struct sockaddr_in);
|
|
si.sin_addr.s_addr = sc->g_src.s_addr;
|
|
error = prison_if(curthread->td_ucred, (struct sockaddr *)&si);
|
|
if (error != 0)
|
|
break;
|
|
bcopy(&si, &ifr->ifr_addr, sizeof(ifr->ifr_addr));
|
|
break;
|
|
case SIOCGIFPDSTADDR:
|
|
#ifdef INET6
|
|
case SIOCGIFPDSTADDR_IN6:
|
|
#endif
|
|
if (sc->g_dst.s_addr == INADDR_ANY) {
|
|
error = EADDRNOTAVAIL;
|
|
break;
|
|
}
|
|
memset(&si, 0, sizeof(si));
|
|
si.sin_family = AF_INET;
|
|
si.sin_len = sizeof(struct sockaddr_in);
|
|
si.sin_addr.s_addr = sc->g_dst.s_addr;
|
|
error = prison_if(curthread->td_ucred, (struct sockaddr *)&si);
|
|
if (error != 0)
|
|
break;
|
|
bcopy(&si, &ifr->ifr_addr, sizeof(ifr->ifr_addr));
|
|
break;
|
|
case GRESKEY:
|
|
error = priv_check(curthread, PRIV_NET_GRE);
|
|
if (error)
|
|
break;
|
|
error = copyin(ifr->ifr_data, &key, sizeof(key));
|
|
if (error)
|
|
break;
|
|
/* adjust MTU for option header */
|
|
if (key == 0 && sc->key != 0) /* clear */
|
|
adj += sizeof(key);
|
|
else if (key != 0 && sc->key == 0) /* set */
|
|
adj -= sizeof(key);
|
|
|
|
if (ifp->if_mtu + adj < 576) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
ifp->if_mtu += adj;
|
|
sc->key = key;
|
|
break;
|
|
case GREGKEY:
|
|
error = copyout(&sc->key, ifr->ifr_data, sizeof(sc->key));
|
|
break;
|
|
|
|
default:
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* computes a route to our destination that is not the one
|
|
* which would be taken by ip_output(), as this one will loop back to
|
|
* us. If the interface is p2p as a--->b, then a routing entry exists
|
|
* If we now send a packet to b (e.g. ping b), this will come down here
|
|
* gets src=a, dst=b tacked on and would from ip_output() sent back to
|
|
* if_gre.
|
|
* Goal here is to compute a route to b that is less specific than
|
|
* a-->b. We know that this one exists as in normal operation we have
|
|
* at least a default route which matches.
|
|
*/
|
|
static int
|
|
gre_compute_route(struct gre_softc *sc)
|
|
{
|
|
struct route *ro;
|
|
|
|
ro = &sc->route;
|
|
|
|
memset(ro, 0, sizeof(struct route));
|
|
((struct sockaddr_in *)&ro->ro_dst)->sin_addr = sc->g_dst;
|
|
ro->ro_dst.sa_family = AF_INET;
|
|
ro->ro_dst.sa_len = sizeof(ro->ro_dst);
|
|
|
|
/*
|
|
* toggle last bit, so our interface is not found, but a less
|
|
* specific route. I'd rather like to specify a shorter mask,
|
|
* but this is not possible. Should work though. XXX
|
|
* XXX MRT Use a different FIB for the tunnel to solve this problem.
|
|
*/
|
|
if ((GRE2IFP(sc)->if_flags & IFF_LINK1) == 0) {
|
|
((struct sockaddr_in *)&ro->ro_dst)->sin_addr.s_addr ^=
|
|
htonl(0x01);
|
|
}
|
|
|
|
#ifdef DIAGNOSTIC
|
|
printf("%s: searching for a route to %s", if_name(GRE2IFP(sc)),
|
|
inet_ntoa(((struct sockaddr_in *)&ro->ro_dst)->sin_addr));
|
|
#endif
|
|
|
|
rtalloc_fib(ro, sc->gre_fibnum);
|
|
|
|
/*
|
|
* check if this returned a route at all and this route is no
|
|
* recursion to ourself
|
|
*/
|
|
if (ro->ro_rt == NULL || ro->ro_rt->rt_ifp->if_softc == sc) {
|
|
#ifdef DIAGNOSTIC
|
|
if (ro->ro_rt == NULL)
|
|
printf(" - no route found!\n");
|
|
else
|
|
printf(" - route loops back to ourself!\n");
|
|
#endif
|
|
return EADDRNOTAVAIL;
|
|
}
|
|
|
|
/*
|
|
* now change it back - else ip_output will just drop
|
|
* the route and search one to this interface ...
|
|
*/
|
|
if ((GRE2IFP(sc)->if_flags & IFF_LINK1) == 0)
|
|
((struct sockaddr_in *)&ro->ro_dst)->sin_addr = sc->g_dst;
|
|
|
|
#ifdef DIAGNOSTIC
|
|
printf(", choosing %s with gateway %s", if_name(ro->ro_rt->rt_ifp),
|
|
inet_ntoa(((struct sockaddr_in *)(ro->ro_rt->rt_gateway))->sin_addr));
|
|
printf("\n");
|
|
#endif
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* do a checksum of a buffer - much like in_cksum, which operates on
|
|
* mbufs.
|
|
*/
|
|
u_int16_t
|
|
gre_in_cksum(u_int16_t *p, u_int len)
|
|
{
|
|
u_int32_t sum = 0;
|
|
int nwords = len >> 1;
|
|
|
|
while (nwords-- != 0)
|
|
sum += *p++;
|
|
|
|
if (len & 1) {
|
|
union {
|
|
u_short w;
|
|
u_char c[2];
|
|
} u;
|
|
u.c[0] = *(u_char *)p;
|
|
u.c[1] = 0;
|
|
sum += u.w;
|
|
}
|
|
|
|
/* end-around-carry */
|
|
sum = (sum >> 16) + (sum & 0xffff);
|
|
sum += (sum >> 16);
|
|
return (~sum);
|
|
}
|
|
|
|
static int
|
|
gremodevent(module_t mod, int type, void *data)
|
|
{
|
|
|
|
switch (type) {
|
|
case MOD_LOAD:
|
|
greattach();
|
|
break;
|
|
case MOD_UNLOAD:
|
|
if_clone_detach(gre_cloner);
|
|
mtx_destroy(&gre_mtx);
|
|
break;
|
|
default:
|
|
return EOPNOTSUPP;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static moduledata_t gre_mod = {
|
|
"if_gre",
|
|
gremodevent,
|
|
0
|
|
};
|
|
|
|
DECLARE_MODULE(if_gre, gre_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
|
|
MODULE_VERSION(if_gre, 1);
|