#include <sys/param.h>
#include <sys/errno.h>
#include <sys/malloc.h>
#include <sys/socket.h>
#include <sys/mbuf.h>
#include <sys/systm.h>
#define _IP_VHL
#include <net/if_var.h>
#include <net/route.h>
#include <net/kpi_protocol.h>
#include <netinet/in_systm.h>
#include <netinet/in.h>
#include <netinet/in_var.h>
#include <netinet6/in6_var.h>
#include <netinet/ip.h>
#include <netinet/ip6.h>
#include <netinet/ip_var.h>
#include <netinet6/ip6_var.h>
#include <netinet/kpi_ipfilter_var.h>
static lck_mtx_t *kipf_lock = 0;
static unsigned long kipf_ref = 0;
static unsigned long kipf_delayed_remove = 0;
__private_extern__ struct ipfilter_list ipv4_filters = TAILQ_HEAD_INITIALIZER(ipv4_filters);
__private_extern__ struct ipfilter_list ipv6_filters = TAILQ_HEAD_INITIALIZER(ipv6_filters);
__private_extern__ struct ipfilter_list tbr_filters = TAILQ_HEAD_INITIALIZER(tbr_filters);
__private_extern__ void
ipf_ref(void)
{
lck_mtx_lock(kipf_lock);
kipf_ref++;
lck_mtx_unlock(kipf_lock);
}
__private_extern__ void
ipf_unref(void)
{
lck_mtx_lock(kipf_lock);
if (kipf_ref == 0)
panic("ipf_unref: kipf_ref == 0\n");
kipf_ref--;
if (kipf_ref == 0 && kipf_delayed_remove != 0) {
struct ipfilter *filter;
while ((filter = TAILQ_FIRST(&tbr_filters))) {
ipf_detach_func ipf_detach = filter->ipf_filter.ipf_detach;
void* cookie = filter->ipf_filter.cookie;
TAILQ_REMOVE(filter->ipf_head, filter, ipf_link);
TAILQ_REMOVE(&tbr_filters, filter, ipf_tbr);
kipf_delayed_remove--;
if (ipf_detach) {
lck_mtx_unlock(kipf_lock);
ipf_detach(cookie);
lck_mtx_lock(kipf_lock);
if (kipf_ref != 0)
break;
}
}
}
lck_mtx_unlock(kipf_lock);
}
static errno_t
ipf_add(
const struct ipf_filter* filter,
ipfilter_t *filter_ref,
struct ipfilter_list *head)
{
struct ipfilter *new_filter;
if (filter->name == NULL || (filter->ipf_input == NULL && filter->ipf_output == NULL))
return EINVAL;
MALLOC(new_filter, struct ipfilter*, sizeof(*new_filter), M_IFADDR, M_WAITOK);
if (new_filter == NULL)
return ENOMEM;
lck_mtx_lock(kipf_lock);
new_filter->ipf_filter = *filter;
new_filter->ipf_head = head;
if (filter->name != NULL &&
strcmp(filter->name, "com.apple.nke.SharedIP") == 0) {
TAILQ_INSERT_TAIL(head, new_filter, ipf_link);
}
else {
TAILQ_INSERT_HEAD(head, new_filter, ipf_link);
}
lck_mtx_unlock(kipf_lock);
*filter_ref = (ipfilter_t)new_filter;
return 0;
}
errno_t
ipf_addv4(
const struct ipf_filter* filter,
ipfilter_t *filter_ref)
{
return ipf_add(filter, filter_ref, &ipv4_filters);
}
errno_t
ipf_addv6(
const struct ipf_filter* filter,
ipfilter_t *filter_ref)
{
return ipf_add(filter, filter_ref, &ipv6_filters);
}
errno_t
ipf_remove(
ipfilter_t filter_ref)
{
struct ipfilter *match = (struct ipfilter*)filter_ref;
struct ipfilter_list *head;
if (match == 0 || (match->ipf_head != &ipv4_filters && match->ipf_head != &ipv6_filters))
return EINVAL;
head = match->ipf_head;
lck_mtx_lock(kipf_lock);
TAILQ_FOREACH(match, head, ipf_link) {
if (match == (struct ipfilter*)filter_ref) {
ipf_detach_func ipf_detach = match->ipf_filter.ipf_detach;
void* cookie = match->ipf_filter.cookie;
if (kipf_ref) {
kipf_delayed_remove++;
TAILQ_INSERT_TAIL(&tbr_filters, match, ipf_tbr);
match->ipf_filter.ipf_input = 0;
match->ipf_filter.ipf_output = 0;
lck_mtx_unlock(kipf_lock);
} else {
TAILQ_REMOVE(head, match, ipf_link);
lck_mtx_unlock(kipf_lock);
if (ipf_detach)
ipf_detach(cookie);
FREE(match, M_IFADDR);
}
return 0;
}
}
lck_mtx_unlock(kipf_lock);
return ENOENT;
}
int log_for_en1 = 0;
errno_t
ipf_inject_input(
mbuf_t data,
ipfilter_t filter_ref)
{
struct mbuf *m = (struct mbuf*)data;
struct m_tag *mtag = 0;
struct ip *ip = mtod(m, struct ip *);
u_int8_t vers;
int hlen;
errno_t error = 0;
protocol_family_t proto;
vers = IP_VHL_V(ip->ip_vhl);
switch (vers) {
case 4:
proto = PF_INET;
break;
case 6:
proto = PF_INET6;
break;
default:
error = ENOTSUP;
goto done;
}
if (filter_ref == 0 && m->m_pkthdr.rcvif == 0) {
m->m_pkthdr.rcvif = ifunit("lo0");
m->m_pkthdr.csum_data = 0;
m->m_pkthdr.csum_flags = 0;
if (vers == 4) {
hlen = IP_VHL_HL(ip->ip_vhl) << 2;
ip->ip_sum = 0;
ip->ip_sum = in_cksum(m, hlen);
}
}
if (filter_ref != 0) {
mtag = m_tag_alloc(KERNEL_MODULE_TAG_ID, KERNEL_TAG_TYPE_IPFILT,
sizeof (ipfilter_t), M_NOWAIT);
if (mtag == NULL) {
error = ENOMEM;
goto done;
}
*(ipfilter_t*)(mtag+1) = filter_ref;
m_tag_prepend(m, mtag);
}
error = proto_inject(proto, data);
done:
return error;
}
static errno_t
ipf_injectv4_out(
mbuf_t data,
ipfilter_t filter_ref,
ipf_pktopts_t options)
{
struct route ro;
struct sockaddr_in *sin = (struct sockaddr_in*)&ro.ro_dst;
struct ip *ip;
struct mbuf *m = (struct mbuf*)data;
errno_t error = 0;
struct m_tag *mtag = 0;
struct ip_moptions *imo = 0, ip_moptions;
if ((size_t)m->m_len < sizeof(struct ip)) {
m = m_pullup(m, sizeof(struct ip));
if (m == NULL) return ENOMEM;
}
ip = (struct ip*)m_mtod(m);
if (filter_ref != 0) {
mtag = m_tag_alloc(KERNEL_MODULE_TAG_ID, KERNEL_TAG_TYPE_IPFILT,
sizeof (ipfilter_t), M_NOWAIT);
if (mtag == NULL) {
m_freem(m);
return ENOMEM;
}
*(ipfilter_t*)(mtag+1) = filter_ref;
m_tag_prepend(m, mtag);
}
if (options && (options->ippo_flags & IPPOF_MCAST_OPTS)) {
imo = &ip_moptions;
bzero(imo, sizeof(struct ip6_moptions));
imo->imo_multicast_ifp = options->ippo_mcast_ifnet;
imo->imo_multicast_ttl = options->ippo_mcast_ttl;
imo->imo_multicast_loop = options->ippo_mcast_loop;
}
bzero(&ro, sizeof(struct route));
sin->sin_len = sizeof(struct sockaddr_in);
sin->sin_family = AF_INET;
sin->sin_port = 0;
sin->sin_addr = ip->ip_dst;
rtalloc(&ro);
if (ro.ro_rt == NULL) {
m_freem(m);
return ENETUNREACH;
}
error = ip_output(m, NULL, &ro, IP_ALLOWBROADCAST | IP_RAWOUTPUT, imo);
if (ro.ro_rt)
rtfree(ro.ro_rt);
return error;
}
static errno_t
ipf_injectv6_out(
mbuf_t data,
ipfilter_t filter_ref,
ipf_pktopts_t options)
{
struct route_in6 ro;
struct sockaddr_in6 *sin6 = &ro.ro_dst;
struct ip6_hdr *ip6;
struct mbuf *m = (struct mbuf*)data;
errno_t error = 0;
struct m_tag *mtag = 0;
struct ip6_moptions *im6o = 0, ip6_moptions;
if ((size_t)m->m_len < sizeof(struct ip6_hdr)) {
m = m_pullup(m, sizeof(struct ip6_hdr));
if (m == NULL) return ENOMEM;
}
ip6 = (struct ip6_hdr*)m_mtod(m);
if (filter_ref != 0) {
mtag = m_tag_alloc(KERNEL_MODULE_TAG_ID, KERNEL_TAG_TYPE_IPFILT,
sizeof (ipfilter_t), M_NOWAIT);
if (mtag == NULL) {
m_freem(m);
return ENOMEM;
}
*(ipfilter_t*)(mtag+1) = filter_ref;
m_tag_prepend(m, mtag);
}
if (options && (options->ippo_flags & IPPOF_MCAST_OPTS)) {
im6o = &ip6_moptions;
bzero(im6o, sizeof(struct ip6_moptions));
im6o->im6o_multicast_ifp = options->ippo_mcast_ifnet;
im6o->im6o_multicast_hlim = options->ippo_mcast_ttl;
im6o->im6o_multicast_loop = options->ippo_mcast_loop;
}
bzero(&ro, sizeof(struct route_in6));
sin6->sin6_len = sizeof(struct sockaddr_in6);
sin6->sin6_family = AF_INET6;
sin6->sin6_addr = ip6->ip6_dst;
#if 0
if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) {
sin6->sin6_scope_id = ntohs(ip6->ip6_dst.s6_addr16[1]);
ip6->ip6_dst.s6_addr16[1] = 0;
} else
sin6->sin6_scope_id = 0;
#endif
rtalloc((struct route*)&ro);
if (ro.ro_rt == NULL) {
m_freem(m);
return ENETUNREACH;
}
error = ip6_output(m, NULL, &ro, 0, im6o, NULL, 0);
if (ro.ro_rt)
rtfree(ro.ro_rt);
return error;
}
errno_t
ipf_inject_output(
mbuf_t data,
ipfilter_t filter_ref,
ipf_pktopts_t options)
{
struct mbuf *m = (struct mbuf*)data;
u_int8_t vers;
errno_t error = 0;
if (m->m_len < 1) {
m = m_pullup(m, 1);
if (m == NULL)
goto done;
}
vers = (*(u_int8_t*)m_mtod(m)) >> 4;
switch (vers)
{
case 4:
error = ipf_injectv4_out(data, filter_ref, options);
break;
case 6:
error = ipf_injectv6_out(data, filter_ref, options);
break;
default:
m_freem(m);
error = ENOTSUP;
break;
}
done:
return error;
}
__private_extern__ ipfilter_t
ipf_get_inject_filter(struct mbuf *m)
{
ipfilter_t filter_ref = 0;
struct m_tag *mtag;
mtag = m_tag_locate(m, KERNEL_MODULE_TAG_ID, KERNEL_TAG_TYPE_IPFILT, NULL);
if (mtag) {
filter_ref = *(ipfilter_t *)(mtag+1);
m_tag_delete(m, mtag);
}
return filter_ref;
}
__private_extern__ int
ipf_init(void)
{
int error = 0;
lck_grp_attr_t *grp_attributes = 0;
lck_attr_t *lck_attributes = 0;
lck_grp_t *lck_grp = 0;
grp_attributes = lck_grp_attr_alloc_init();
if (grp_attributes == 0) {
printf("ipf_init: lck_grp_attr_alloc_init failed\n");
error = ENOMEM;
goto done;
}
lck_grp_attr_setdefault(grp_attributes);
lck_grp = lck_grp_alloc_init("IP Filter", grp_attributes);
if (lck_grp == 0) {
printf("ipf_init: lck_grp_alloc_init failed\n");
error = ENOMEM;
goto done;
}
lck_attributes = lck_attr_alloc_init();
if (lck_attributes == 0) {
printf("ipf_init: lck_attr_alloc_init failed\n");
error = ENOMEM;
goto done;
}
lck_attr_setdefault(lck_attributes);
kipf_lock = lck_mtx_alloc_init(lck_grp, lck_attributes);
if (kipf_lock == 0) {
printf("ipf_init: lck_mtx_alloc_init failed\n");
error = ENOMEM;
goto done;
}
done:
if (error != 0) {
if (kipf_lock) {
lck_mtx_free(kipf_lock, lck_grp);
kipf_lock = 0;
}
}
if (lck_grp) {
lck_grp_free(lck_grp);
lck_grp = 0;
}
if (grp_attributes) {
lck_grp_attr_free(grp_attributes);
grp_attributes = 0;
}
if (lck_attributes) {
lck_attr_free(lck_attributes);
lck_attributes = 0;
}
return error;
}