+/*
+ * Copyright (c) 2011 Apple Inc. All rights reserved.
+ *
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
+ *
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. The rights granted to you under the License
+ * may not be used to create, or enable the creation or redistribution of,
+ * unlawful or unlicensed copies of an Apple operating system, or to
+ * circumvent, violate, or enable the circumvention or violation of, any
+ * terms of an Apple operating system software license agreement.
+ *
+ * Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this file.
+ *
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ *
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
+ */
+
+#include <sys/param.h>
+#include <sys/types.h>
+#include <sys/kpi_mbuf.h>
+#include <sys/socket.h>
+#include <sys/kern_control.h>
+#include <sys/mcache.h>
+#include <sys/socketvar.h>
+
+#include <kern/debug.h>
+
+#include <libkern/libkern.h>
+
+#include <net/if.h>
+#include <net/route.h>
+
+#include <netinet/in.h>
+#include <netinet/ip.h>
+#include <netinet/ip_var.h>
+#include <netinet/in_var.h>
+#include <netinet/ip6.h>
+#include <netinet6/ip6_var.h>
+
+#include <net/netsrc.h>
+
+static errno_t netsrc_ctlsend(kern_ctl_ref, uint32_t, void *, mbuf_t, int);
+static errno_t netsrc_ctlconnect(kern_ctl_ref, struct sockaddr_ctl *, void **);
+static errno_t netsrc_ipv4(kern_ctl_ref, uint32_t, struct netsrc_req *);
+static errno_t netsrc_ipv6(kern_ctl_ref, uint32_t, struct netsrc_req *);
+
+static kern_ctl_ref netsrc_ctlref = NULL;
+
+__private_extern__ void
+netsrc_init(void)
+{
+ errno_t error;
+ struct kern_ctl_reg netsrc_ctl = {
+ .ctl_connect = netsrc_ctlconnect,
+ .ctl_send = netsrc_ctlsend,
+ };
+
+ strlcpy(netsrc_ctl.ctl_name, NETSRC_CTLNAME, sizeof(NETSRC_CTLNAME));
+
+ if ((error = ctl_register(&netsrc_ctl, &netsrc_ctlref)))
+ printf("%s: ctl_register failed %d\n", __func__, error);
+}
+
+static errno_t
+netsrc_ctlconnect(kern_ctl_ref kctl, struct sockaddr_ctl *sac, void **uinfo)
+{
+#pragma unused(kctl, sac, uinfo)
+
+ /*
+ * We don't need to do anything here. This callback is only necessary
+ * for ctl_register() to succeed.
+ */
+ return (0);
+}
+
+static errno_t
+netsrc_ctlsend(kern_ctl_ref kctl, uint32_t unit, void *uinfo, mbuf_t m,
+ int flags)
+{
+#pragma unused(uinfo, flags)
+ errno_t error;
+ struct netsrc_req *nrq, storage;
+
+ if (mbuf_pkthdr_len(m) < sizeof(*nrq)) {
+ error = EINVAL;
+ goto out;
+ }
+ if (mbuf_len(m) >= sizeof(*nrq))
+ nrq = mbuf_data(m);
+ else {
+ mbuf_copydata(m, 0, sizeof(storage), &storage);
+ nrq = &storage;
+ }
+ /* We only have one version right now. */
+ if (nrq->nrq_ver != NETSRC_VERSION1) {
+ error = EINVAL;
+ goto out;
+ }
+ switch (nrq->nrq_sin.sin_family) {
+ case AF_INET:
+ error = netsrc_ipv4(kctl, unit, nrq);
+ break;
+ case AF_INET6:
+ error = netsrc_ipv6(kctl, unit, nrq);
+ break;
+ default:
+ printf("%s: invalid family\n", __func__);
+ error = EINVAL;
+ }
+out:
+ mbuf_freem(m);
+
+ return (error);
+
+}
+
+static errno_t
+netsrc_ipv4(kern_ctl_ref kctl, uint32_t unit, struct netsrc_req *nrq)
+{
+ errno_t error = EHOSTUNREACH;
+ struct sockaddr_in *dstsin;
+ struct rtentry *rt;
+ struct in_ifaddr *ia;
+ struct netsrc_rep nrp;
+ struct sockaddr_in6 v4entry = {
+ .sin6_family = AF_INET6,
+ .sin6_len = sizeof(struct sockaddr_in6),
+ .sin6_addr = IN6ADDR_V4MAPPED_INIT,
+ };
+ struct in6_addrpolicy *policy;
+
+ dstsin = &nrq->nrq_sin;
+
+ if (dstsin->sin_len < sizeof (*dstsin) ||
+ dstsin->sin_addr.s_addr == INADDR_ANY)
+ return (EINVAL);
+
+ lck_mtx_lock(rnh_lock);
+ rt = rt_lookup(TRUE, (struct sockaddr *)dstsin, NULL,
+ rt_tables[AF_INET], nrq->nrq_ifscope);
+ lck_mtx_unlock(rnh_lock);
+ if (!rt)
+ return (EHOSTUNREACH);
+ lck_rw_lock_shared(in_ifaddr_rwlock);
+ TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) {
+ IFA_LOCK_SPIN(&ia->ia_ifa);
+ if (ia->ia_ifp == rt->rt_ifp) {
+ memset(&nrp, 0, sizeof(nrp));
+ memcpy(&nrp.nrp_sin, IA_SIN(ia), sizeof(nrp.nrp_sin));
+ IFA_UNLOCK(&ia->ia_ifa);
+ v4entry.sin6_addr.s6_addr32[3] =
+ nrp.nrp_sin.sin_addr.s_addr;
+ policy = in6_addrsel_lookup_policy(&v4entry);
+ if (policy->label != -1) {
+ nrp.nrp_label = policy->label;
+ nrp.nrp_precedence = policy->preced;
+ /* XXX might not be true */
+ nrp.nrp_dstlabel = policy->label;
+ nrp.nrp_dstprecedence = policy->preced;
+ }
+ error = ctl_enqueuedata(kctl, unit, &nrp,
+ sizeof(nrp), CTL_DATA_EOR);
+ break;
+ }
+ IFA_UNLOCK(&ia->ia_ifa);
+ }
+ lck_rw_done(in_ifaddr_rwlock);
+ if (rt)
+ rtfree(rt);
+
+ return (error);
+}
+
+static errno_t
+netsrc_ipv6(kern_ctl_ref kctl, uint32_t unit, struct netsrc_req *nrq)
+{
+ struct sockaddr_in6 *dstsin6;
+ struct in6_addr *in6, storage;
+ struct in6_ifaddr *ia;
+ struct route_in6 ro;
+ int error = EHOSTUNREACH;
+ struct netsrc_rep nrp;
+
+ dstsin6 = &nrq->nrq_sin6;
+
+ if (dstsin6->sin6_len < sizeof (*dstsin6) ||
+ IN6_IS_ADDR_UNSPECIFIED(&dstsin6->sin6_addr))
+ return (EINVAL);
+
+ memset(&ro, 0, sizeof(ro));
+ lck_mtx_lock(rnh_lock);
+ ro.ro_rt = rt_lookup(TRUE, (struct sockaddr *)dstsin6, NULL,
+ rt_tables[AF_INET6], nrq->nrq_ifscope);
+ lck_mtx_unlock(rnh_lock);
+ if (!ro.ro_rt)
+ return (EHOSTUNREACH);
+ in6 = in6_selectsrc(dstsin6, NULL, NULL, &ro, NULL, &storage,
+ nrq->nrq_ifscope, &error);
+ if (ro.ro_rt)
+ rtfree(ro.ro_rt);
+ if (!in6 || error)
+ return (error);
+ memset(&nrp, 0, sizeof(nrp));
+ nrp.nrp_sin6.sin6_family = AF_INET6;
+ nrp.nrp_sin6.sin6_len = sizeof(nrp.nrp_sin6);
+ memcpy(&nrp.nrp_sin6.sin6_addr, in6, sizeof(nrp.nrp_sin6.sin6_addr));
+ lck_rw_lock_shared(&in6_ifaddr_rwlock);
+ for (ia = in6_ifaddrs; ia; ia = ia->ia_next) {
+ if (memcmp(&ia->ia_addr.sin6_addr, in6, sizeof(*in6)) == 0) {
+ struct sockaddr_in6 sin6;
+ struct in6_addrpolicy *policy;
+
+ if (ia->ia6_flags & IN6_IFF_TEMPORARY)
+ nrp.nrp_flags |= NETSRC_IP6_FLAG_TEMPORARY;
+ if (ia->ia6_flags & IN6_IFF_TENTATIVE)
+ nrp.nrp_flags |= NETSRC_IP6_FLAG_TENTATIVE;
+ if (ia->ia6_flags & IN6_IFF_DEPRECATED)
+ nrp.nrp_flags |= NETSRC_IP6_FLAG_DEPRECATED;
+ sin6.sin6_family = AF_INET6;
+ sin6.sin6_len = sizeof(sin6);
+ memcpy(&sin6.sin6_addr, in6, sizeof(*in6));
+ policy = in6_addrsel_lookup_policy(&sin6);
+ if (policy->label != -1) {
+ nrp.nrp_label = policy->label;
+ nrp.nrp_precedence = policy->preced;
+ }
+ memcpy(&sin6.sin6_addr, &dstsin6->sin6_addr,
+ sizeof(dstsin6->sin6_addr));
+ policy = in6_addrsel_lookup_policy(&sin6);
+ if (policy->label != -1) {
+ nrp.nrp_dstlabel = policy->label;
+ nrp.nrp_dstprecedence = policy->preced;
+ }
+ break;
+ }
+ }
+ lck_rw_done(&in6_ifaddr_rwlock);
+ error = ctl_enqueuedata(kctl, unit, &nrp, sizeof(nrp),
+ CTL_DATA_EOR);
+
+ return (error);
+}
projects / apple / xnu.git / blobdiff