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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2009 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/*
* DL_IPV4 MAC Type plugin for the Nemo mac module
*/
#include <sys/types.h>
#include <sys/modctl.h>
#include <sys/dlpi.h>
#include <sys/mac.h>
#include <sys/mac_ipv4.h>
#include <sys/byteorder.h>
#include <sys/strsun.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <inet/common.h>
#include <inet/ip.h>
#include <inet/iptun.h>
static struct modlmisc mac_ipv4_modlmisc = {
&mod_miscops,
"IPv4 tunneling MAC plugin"
};
static struct modlinkage mac_ipv4_modlinkage = {
MODREV_1,
&mac_ipv4_modlmisc,
NULL
};
static mactype_ops_t mac_ipv4_type_ops;
int
_init(void)
{
mactype_register_t *mtrp;
int err;
if ((mtrp = mactype_alloc(MACTYPE_VERSION)) == NULL)
return (ENOTSUP);
mtrp->mtr_ident = MAC_PLUGIN_IDENT_IPV4;
mtrp->mtr_ops = &mac_ipv4_type_ops;
mtrp->mtr_mactype = DL_IPV4;
mtrp->mtr_nativetype = DL_IPV4;
mtrp->mtr_addrlen = sizeof (ipaddr_t);
if ((err = mactype_register(mtrp)) == 0) {
if ((err = mod_install(&mac_ipv4_modlinkage)) != 0)
(void) mactype_unregister(MAC_PLUGIN_IDENT_IPV4);
}
mactype_free(mtrp);
return (err);
}
int
_fini(void)
{
int err;
if ((err = mactype_unregister(MAC_PLUGIN_IDENT_IPV4)) != 0)
return (err);
return (mod_remove(&mac_ipv4_modlinkage));
}
int
_info(struct modinfo *modinfop)
{
return (mod_info(&mac_ipv4_modlinkage, modinfop));
}
/*
* MAC Type plugin operations
*/
/* ARGSUSED */
int
mac_ipv4_unicst_verify(const void *addr, void *pdata)
{
const ipaddr_t *ipaddr = addr;
return ((CLASSD(*ipaddr) || (*ipaddr == INADDR_BROADCAST)) ?
EINVAL : 0);
}
/* ARGSUSED */
int
mac_ipv4_multicst_verify(const void *addr, void *pdata)
{
/*
* IPv4 configured tunnels do not have the concept of link-layer
* multicast.
*/
return (ENOTSUP);
}
/*
* Check the legality of an IPv4 tunnel SAP value. The only two acceptable
* values are IPPROTO_ENCAP (IPv4 in IPv4) and IPPROTO_IPV6 (IPv6 in IPv4).
*/
/* ARGSUSED */
boolean_t
mac_ipv4_sap_verify(uint32_t sap, uint32_t *bind_sap, void *pdata)
{
if (sap == IPPROTO_ENCAP || sap == IPPROTO_IPV6 || sap == 0) {
if (bind_sap != NULL)
*bind_sap = sap;
return (B_TRUE);
}
return (B_FALSE);
}
/*
* Build an IPv4 link-layer header for tunneling. If provided, the
* template header provided by the driver supplies the header length, type
* of service, don't fragment flag, ttl, and potential options (depending
* on the header length).
*/
/* ARGSUSED */
mblk_t *
mac_ipv4_header(const void *saddr, const void *daddr, uint32_t sap, void *pdata,
mblk_t *payload, size_t extra_len)
{
struct ip *iphp;
struct ip *tmpl_iphp = pdata;
mblk_t *mp;
size_t hdr_len = sizeof (struct ip);
if (!mac_ipv4_sap_verify(sap, NULL, NULL))
return (NULL);
if (tmpl_iphp != NULL)
hdr_len = tmpl_iphp->ip_hl * sizeof (uint32_t);
if ((mp = allocb(hdr_len + extra_len, BPRI_HI)) == NULL)
return (NULL);
iphp = (struct ip *)mp->b_rptr;
bzero(iphp, hdr_len + extra_len);
if (tmpl_iphp != NULL) {
bcopy(tmpl_iphp, iphp, hdr_len);
} else {
iphp->ip_hl = IP_SIMPLE_HDR_LENGTH_IN_WORDS;
iphp->ip_off = htons(IP_DF);
iphp->ip_ttl = IPTUN_DEFAULT_HOPLIMIT;
}
iphp->ip_v = IPVERSION;
iphp->ip_len = 0;
iphp->ip_p = (uint8_t)sap;
bcopy(saddr, &(iphp->ip_src), sizeof (struct in_addr));
bcopy(daddr, &(iphp->ip_dst), sizeof (struct in_addr));
mp->b_wptr += hdr_len;
return (mp);
}
/* ARGSUSED */
int
mac_ipv4_header_info(mblk_t *mp, void *pdata, mac_header_info_t *hdr_info)
{
struct ip *iphp;
if (MBLKL(mp) < sizeof (struct ip))
return (EINVAL);
iphp = (struct ip *)mp->b_rptr;
/*
* IPv4 tunnels don't have a concept of link-layer multicast since
* they have fixed unicast endpoints.
*/
if (mac_ipv4_unicst_verify(&iphp->ip_dst, NULL) != 0)
return (EINVAL);
hdr_info->mhi_hdrsize = iphp->ip_hl * sizeof (uint32_t);
hdr_info->mhi_pktsize = 0;
hdr_info->mhi_daddr = (const uint8_t *)&(iphp->ip_dst);
hdr_info->mhi_saddr = (const uint8_t *)&(iphp->ip_src);
hdr_info->mhi_origsap = hdr_info->mhi_bindsap = iphp->ip_p;
hdr_info->mhi_dsttype = MAC_ADDRTYPE_UNICAST;
return (0);
}
/*
* Plugin data is either NULL or a pointer to an IPv4 header.
*/
boolean_t
mac_ipv4_pdata_verify(void *pdata, size_t pdata_size)
{
const struct ip *iphp = pdata;
if (pdata == NULL)
return (pdata_size == 0);
if (pdata_size < sizeof (struct ip))
return (B_FALSE);
/* Make sure that the header length field matches pdata_size */
return (pdata_size == iphp->ip_hl * sizeof (uint32_t));
}
static mactype_ops_t mac_ipv4_type_ops = {
MTOPS_PDATA_VERIFY,
mac_ipv4_unicst_verify,
mac_ipv4_multicst_verify,
mac_ipv4_sap_verify,
mac_ipv4_header,
mac_ipv4_header_info,
mac_ipv4_pdata_verify,
NULL,
NULL,
NULL
};
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