blob: f7bb7f9439220f3d528d972921b107ce0330ca9f [file] [log] [blame] [raw]
/*
* Copyright (C) 1993-2001 by Darren Reed.
* (C)opyright 1997 by Marc Boucher.
*
* See the IPFILTER.LICENCE file for details on licencing.
*
*/
/* TODO: (MARCXXX)
- ipl_init failure -> open ENODEV or whatever
- prevent multiple LKM loads
- surround access to ifnet structures by IFNET_LOCK()/IFNET_UNLOCK() ?
- m != m1 problem
*/
#include <sys/types.h>
#include <sys/conf.h>
#ifdef IPFILTER_LKM
#include <sys/mload.h>
#endif
#include <sys/systm.h>
#include <sys/errno.h>
#include <net/if.h>
#include <net/route.h>
#include <netinet/in.h>
#ifdef IFF_DRVRLOCK /* IRIX6 */
#include <sys/hashing.h>
#include <netinet/in_var.h>
#endif
#include <sys/mbuf.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/ip_var.h>
#include <netinet/tcp.h>
#include <netinet/udp.h>
#include <netinet/tcpip.h>
#include <netinet/ip_icmp.h>
#include <netinet/ipfilter.h>
#include "ipl.h"
#include "ip_compat.h"
#include "ip_fil.h"
#include "ip_nat.h"
#ifndef MBUF_IS_CLUSTER
# define MBUF_IS_CLUSTER(m) ((m)->m_flags & MCL_CLUSTER)
#endif
#undef IPFDEBUG /* #define IPFDEBUG 9 */
#ifdef IPFILTER_LKM
u_int ipldevflag = D_MP;
char *iplmversion = M_VERSION;
#else
u_int ipfilterdevflag = D_MP;
char *ipfiltermversion = M_VERSION;
#endif
ipfmutex_t ipl_mutex, ipfi_mutex, ipf_rw, ipf_stinsert, ipf_auth_mx;
ipfmutex_t ipf_nat_new, ipf_natio, ipf_timeoutlock;
ipfrwlock_t ipf_frag, ipf_state, ipf_nat, ipf_natfrag, ipf_auth;
ipfrwlock_t ipf_global, ipf_mutex, ipf_ipidfrag, ipf_frcache, ipf_tokens;
int (*ipf_checkp) __P((struct ip *, int, void *, int, mb_t **));
#ifdef IPFILTER_LKM
static int *ipff_addr = 0;
static int ipff_value;
static __psunsigned_t *ipfk_addr = 0;
static __psunsigned_t ipfk_code[4];
#endif
static void nifattach();
static void nifdetach();
typedef struct nif {
struct nif *nf_next;
struct ifnet *nf_ifp;
#if (IRIX < 60500)
int (*nf_output)(struct ifnet *, struct mbuf *, struct sockaddr *);
#else
int (*nf_output)(struct ifnet *, struct mbuf *, struct sockaddr *,
struct rtentry *);
#endif
char nf_name[LIFNAMSIZ];
int nf_unit;
} nif_t;
static nif_t *nif_head = 0;
static int nif_interfaces = 0;
extern int in_interfaces;
#if IRIX >= 60500
toid_t ipf_timer_id;
#endif
extern ipnat_t *nat_list;
#ifdef IPFDEBUG
static void ipf_dumppacket(m)
struct mbuf *m;
{
u_char *s;
char *t, line[80];
int len, off, i;
off = 0;
while (m != NULL) {
len = M_LEN(m);
s = mtod(m, u_char *);
printf("mbuf 0x%lx len %d flags %x type %d\n",
m, len, m->m_flags, m->m_type);
printf("dat 0x%lx off 0x%lx/%d s 0x%lx next 0x%lx\n",
m->m_dat, m->m_off, m->m_off, s, m->m_next);
while (len > 0) {
t = line;
for (i = 0; (i < 16) && (len > 0); len--, i++)
sprintf(t, " %02x", *s++), t += strlen(t);
*s = '\0';
printf("mbuf:%x:%s\n", off, line);
off += 16;
}
m = m->m_next;
}
}
#endif
static int
#if IRIX < 60500
ipl_if_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst)
#else
ipl_if_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
struct rtentry *rt)
#endif
{
#if (IPFDEBUG >= 0)
static unsigned int cnt = 0;
#endif
nif_t *nif;
MUTEX_ENTER(&ipfi_mutex); /* sets interrupt priority level to splhi */
for (nif = nif_head; nif; nif = nif->nf_next)
if (nif->nf_ifp == ifp)
break;
MUTEX_EXIT(&ipfi_mutex);
if (nif == NULL) {
printf("IP Filter: ipl_if_output intf %x NOT FOUND\n", ifp);
return ENETDOWN;
}
#if (IPFDEBUG >= 7)
if ((++cnt % 200) == 0)
printf("IP Filter: ipl_if_output(ifp=0x%lx, m=0x%lx, dst=0x%lx), m_type=%d m_flags=0x%lx m_off=0x%lx\n", ifp, m, dst, m->m_type, (u_long)m->m_flags, m->m_off);
#endif
if (ipf_checkp) {
struct mbuf *m1 = m;
struct ip *ip;
int hlen;
switch(m->m_type)
{
case MT_HEADER:
if (m->m_len == 0) {
if (m->m_next == NULL)
break;
m = m->m_next;
}
/* FALLTHROUGH */
case MT_DATA:
if (!MBUF_IS_CLUSTER(m) &&
((m->m_off < MMINOFF) || (m->m_off > MMAXOFF))) {
#if (IPFDEBUG >= 4)
printf("IP Filter: ipl_if_output: bad m_off m_type=%d m_flags=0x%lx m_off=0x%lx\n", m->m_type, (u_long)m->m_flags, m->m_off);
#endif
break;
}
if (m->m_len < sizeof(char)) {
#if (IPFDEBUG >= 3)
printf("IP Filter: ipl_if_output: mbuf block too small (m_len=%d) for IP vers+hlen, m_type=%d m_flags=0x%lx\n", m->m_len, m->m_type, (u_long)m->m_flags);
#endif
break;
}
ip = mtod(m, struct ip *);
if (ip->ip_v != IPVERSION) {
#if (IPFDEBUG >= 2)
ipf_dumppacket(m);
printf("IP Filter: ipl_if_output: bad ip_v m_type=%d m_flags=0x%lx m_off=0x%lx\n", m->m_type, (u_long)m->m_flags, m->m_off);
#endif
break;
}
hlen = ip->ip_hl << 2;
if ((*ipf_checkp)(ip, hlen, ifp, 1, &m1) || (m1 == NULL))
return EHOSTUNREACH;
m = m1;
break;
default:
#if (IPFDEBUG >= 2)
printf("IP Filter: ipl_if_output: bad m_type=%d m_flags=0x%lxm_off=0x%lx\n", m->m_type, (u_long)m->m_flags, m->m_off);
#endif
break;
}
}
#if (IRIX < 60500)
return (*nif->nf_output)(ifp, m, dst);
#else
return (*nif->nf_output)(ifp, m, dst, rt);
#endif
}
int
#if !defined(IPFILTER_LKM) && (IRIX >= 60500)
ipfilter_kernel(struct ifnet *rcvif, struct mbuf *m)
#else
ipl_kernel(struct ifnet *rcvif, struct mbuf *m)
#endif
{
#if (IPFDEBUG >= 7)
static unsigned int cnt = 0;
if ((++cnt % 200) == 0)
printf("IP Filter: ipl_kernel(rcvif=0x%lx, m=0x%lx\n",
rcvif, m);
#endif
if (ipf_running <= 0)
return IPF_ACCEPTIT;
/*
* Check if we want to allow this packet to be processed.
* Consider it to be bad if not.
*/
if (ipf_checkp) {
struct mbuf *m1 = m;
struct ip *ip;
int hlen;
if ((m->m_type != MT_DATA) && (m->m_type != MT_HEADER)) {
#if (IPFDEBUG >= 4)
printf("IP Filter: ipl_kernel: bad m_type=%d m_flags=0x%lx m_off=0x%lx\n", m->m_type, (u_long)m->m_flags, m->m_off);
#endif
return IPF_ACCEPTIT;
}
if (!MBUF_IS_CLUSTER(m) &&
((m->m_off < MMINOFF) || (m->m_off > MMAXOFF))) {
#if (IPFDEBUG >= 4)
printf("IP Filter: ipl_kernel: bad m_off m_type=%d m_flags=0x%lx m_off=0x%lx\n", m->m_type, (u_long)m->m_flags, m->m_off);
#endif
return IPF_ACCEPTIT;
}
if (m->m_len < sizeof(char)) {
#if (IPFDEBUG >= 1)
printf("IP Filter: ipl_kernel: mbuf block too small (m_len=%d) for IP vers+hlen, m_type=%d m_flags=0x%lx\n", m->m_len, m->m_type, (u_long)m->m_flags);
#endif
return IPF_ACCEPTIT;
}
ip = mtod(m, struct ip *);
if (ip->ip_v != IPVERSION) {
#if (IPFDEBUG >= 4)
printf("IP Filter: ipl_kernel: bad ip_v\n");
#endif
m_freem(m);
return IPF_DROPIT;
}
ip->ip_len = htons(ip->ip_len);
ip->ip_off = htons(ip->ip_off);
hlen = ip->ip_hl << 2;
if ((*ipf_checkp)(ip, hlen, rcvif, 0, &m1) || !m1)
return IPF_DROPIT;
ip = mtod(m1, struct ip *);
ip->ip_len = ntohs(ip->ip_len);
ip->ip_off = ntohs(ip->ip_off);
#if (IPFDEBUG >= 2)
if (m != m1)
printf("IP Filter: ipl_kernel: m != m1\n");
#endif
}
return IPF_ACCEPTIT;
}
int
ipl_ipfilter_attach(void)
{
#if defined(IPFILTER_LKM)
__psunsigned_t *addr_ff, *addr_fk;
st_findaddr("ipfilterflag", &addr_ff);
# if (IPFDEBUG >= 1)
printf("IP Filter: st_findaddr ipfilterflag=0x%lx\n", addr_ff);
# endif
if (!addr_ff)
return ESRCH;
st_findaddr("ipfilter_kernel", &addr_fk);
# if (IPFDEBUG >= 1)
printf("IP Filter: st_findaddr ipfilter_kernel=0x%lx\n", addr_fk);
# endif
if (!addr_fk)
return ESRCH;
MUTEX_ENTER(&ipfi_mutex); /* sets interrupt priority level to splhi */
ipff_addr = (int *)addr_ff;
ipff_value = *ipff_addr;
*ipff_addr = 0;
ipfk_addr = addr_fk;
bcopy(ipfk_addr, ipfk_code, sizeof(ipfk_code));
/* write a "li t4, ipl_kernel" instruction */
ipfk_addr[0] = 0x3c0c0000 |
(((__psunsigned_t)ipl_kernel >> 16) & 0xffff);
ipfk_addr[1] = 0x358c0000 |
((__psunsigned_t)ipl_kernel & 0xffff);
/* write a "jr t4" instruction" */
ipfk_addr[2] = 0x01800008;
/* write a "nop" instruction */
ipfk_addr[3] = 0;
icache_inval(ipfk_addr, sizeof(ipfk_code));
*ipff_addr = 1; /* enable ipfilter_kernel */
MUTEX_EXIT(&ipfi_mutex);
#else
extern int ipfilterflag;
ipfilterflag = 1;
#endif
nif_interfaces = 0;
nifattach();
return 0;
}
/*
* attach the packet filter to each non-loopback interface that is running
*/
static void
nifattach()
{
nif_t *nif, *qf2;
struct ifnet *ifp;
struct frentry *f;
ipnat_t *np;
MUTEX_ENTER(&ipfi_mutex); /* sets interrupt priority level to splhi */
for (ifp = ifnet; ifp; ifp = ifp->if_next) {
if ((!(ifp->if_flags & IFF_RUNNING)) ||
(ifp->if_flags & IFF_LOOPBACK))
continue;
/*
* Look for entry already setup for this device
*/
for (nif = nif_head; nif; nif = nif->nf_next)
if (nif->nf_ifp == ifp)
break;
if (nif)
continue;
if (ifp->if_output == ipl_if_output) {
printf("IP Filter: ERROR INTF 0x%lx STILL ATTACHED\n",
ifp);
continue;
}
#if (IPFDEBUG >= 2)
printf("IP Filter: nifattach nif %x opt %x\n",
ifp, ifp->if_output);
#endif
KMALLOC(nif, nif_t *);
if (!nif) {
printf("IP Filter: malloc(%d) for nif_t failed\n",
sizeof(nif_t));
continue;
}
nif->nf_ifp = ifp;
(void) strncpy(nif->nf_name, ifp->if_name,
sizeof(nif->nf_name));
nif->nf_name[sizeof(nif->nf_name) - 1] = '\0';
nif->nf_unit = ifp->if_unit;
nif->nf_next = nif_head;
nif_head = nif;
/*
* Activate any rules directly associated with this interface
*/
WRITE_ENTER(&ipf_mutex);
for (f = ipf_rules[0][0]; f; f = f->fr_next) {
if ((f->fr_ifa == (struct ifnet *)-1)) {
if (f->fr_ifname[0] &&
(GETIFP(f->fr_ifname, 4) == ifp))
f->fr_ifa = ifp;
}
}
for (f = ipf_rules[1][0]; f; f = f->fr_next) {
if ((f->fr_ifa == (struct ifnet *)-1)) {
if (f->fr_ifname[0] &&
(GETIFP(f->fr_ifname, 4) == ifp))
f->fr_ifa = ifp;
}
}
RWLOCK_EXIT(&ipf_mutex);
WRITE_ENTER(&ipf_nat);
for (np = nat_list; np; np = np->in_next) {
if ((np->in_ifps[0] == (void *)-1)) {
if (np->in_ifnames[0][0] &&
(GETIFP(np->in_ifnames[0], 4) == ifp))
np->in_ifps[0] = (void *)ifp;
}
if ((np->in_ifps[1] == (void *)-1)) {
if (np->in_ifnames[1][0] &&
(GETIFP(np->in_ifnames[1], 4) == ifp))
np->in_ifps[1] = (void *)ifp;
}
}
RWLOCK_EXIT(&ipf_nat);
nif->nf_output = ifp->if_output;
ifp->if_output = ipl_if_output;
#if (IPFDEBUG >= 2)
printf("IP Filter: nifattach: ifp(%lx)->if_output FROM %lx TO %lx\n",
ifp, nif->nf_output, ifp->if_output);
#endif
printf("IP Filter: attach to [%s,%d]\n",
nif->nf_name, ifp->if_unit);
}
if (!nif_head)
printf("IP Filter: not attached to any interfaces\n");
nif_interfaces = in_interfaces;
MUTEX_EXIT(&ipfi_mutex);
return;
}
/*
* unhook the IP filter from all defined interfaces with IP addresses
*/
static void
nifdetach()
{
nif_t *nif, *qf2, **qp;
struct ifnet *ifp;
MUTEX_ENTER(&ipfi_mutex); /* sets interrupt priority level to splhi */
/*
* Make two passes, first get rid of all the unknown devices, next
* unlink known devices.
*/
for (qp = &nif_head; (nif = *qp); ) {
for (ifp = ifnet; ifp; ifp = ifp->if_next)
if (nif->nf_ifp == ifp)
break;
if (ifp) {
qp = &nif->nf_next;
continue;
}
printf("IP Filter: removing [%s]\n", nif->nf_name);
*qp = nif->nf_next;
KFREE(nif);
}
while ((nif = nif_head)) {
nif_head = nif->nf_next;
for (ifp = ifnet; ifp; ifp = ifp->if_next)
if (nif->nf_ifp == ifp)
break;
if (ifp) {
printf("IP Filter: detaching [%s,%d]\n",
nif->nf_name, ifp->if_unit);
#if (IPFDEBUG >= 4)
printf("IP Filter: nifdetach: ifp(%lx)->if_output FROM %lx TO %lx\n",
ifp, ifp->if_output, nif->nf_output);
#endif
ifp->if_output = nif->nf_output;
}
KFREE(nif);
}
MUTEX_EXIT(&ipfi_mutex);
return;
}
void
ipl_ipfilter_detach(void)
{
#ifdef IPFILTER_LKM
nifdetach();
MUTEX_ENTER(&ipfi_mutex); /* sets interrupt priority level to splhi */
if (ipff_addr) {
*ipff_addr = 0;
if (ipfk_addr) {
bcopy(ipfk_code, ipfk_addr, sizeof(ipfk_code));
icache_inval(ipfk_addr - 16, sizeof(ipfk_code)+32);
}
*ipff_addr = ipff_value;
}
MUTEX_EXIT(&ipfi_mutex);
#else
extern int ipfilterflag;
nifdetach();
ipfilterflag = 0;
#endif
}
/* this function is called from ipf_slowtimer at 500ms intervals to
keep our interface list in sync */
void
ipl_ipfilter_intfsync(void)
{
MUTEX_ENTER(&ipfi_mutex);
if (nif_interfaces != in_interfaces) {
/* if the number of interfaces has changed, resync */
MUTEX_EXIT(&ipfi_mutex);
ipf_sync(&ipfmain, NULL);
} else
MUTEX_EXIT(&ipfi_mutex);
}
#ifdef IPFILTER_LKM
/* this routine should be treated as an interrupt routine and should
not call any routines that would cause it to sleep, such as: biowait(),
sleep(), psema() or delay().
*/
int
iplunload(void)
{
int error = 0;
if (ipf_refcnt)
return EBUSY;
WRITE_ENTER(&ipf_global);
error = ipl_detach();
if (error != 0) {
RWLOCK_EXIT(&ipf_global);
return error;
}
ipf_running = -2;
#if (IRIX < 60500)
LOCK_DEALLOC(ipl_mutex.l);
LOCK_DEALLOC(ipf_rw.l);
LOCK_DEALLOC(ipf_auth.l);
LOCK_DEALLOC(ipf_natfrag.l);
LOCK_DEALLOC(ipf_ipidfrag.l);
LOCK_DEALLOC(ipf_tokens.l);
LOCK_DEALLOC(ipf_stinsert.l);
LOCK_DEALLOC(ipf_nat_new.l);
LOCK_DEALLOC(ipf_natio.l);
LOCK_DEALLOC(ipf_nat.l);
LOCK_DEALLOC(ipf_state.l);
LOCK_DEALLOC(ipf_frag.l);
LOCK_DEALLOC(ipf_auth_mx.l);
LOCK_DEALLOC(ipf_mutex.l);
LOCK_DEALLOC(ipf_frcache.l);
LOCK_DEALLOC(ipfi_mutex.l);
RWLOCK_EXIT(&ipf_global);
LOCK_DEALLOC(ipf_global.l);
#else
MUTEX_DESTROY(&ipf_rw);
MUTEX_DESTROY(&ipfi_mutex);
MUTEX_DESTROY(&ipf_timeoutlock);
RW_DESTROY(&ipf_mutex);
RW_DESTROY(&ipf_frcache);
RW_DESTROY(&ipf_tokens);
RWLOCK_EXIT(&ipf_global);
delay(hz);
RW_DESTROY(&ipf_global);
#endif
printf("%s unloaded\n", ipfilter_version);
delay(hz);
return 0;
}
#endif
void
ipfilterinit(void)
{
#ifdef IPFILTER_LKM
int error;
#endif
#if (IRIX < 60500)
ipfi_mutex.l = LOCK_ALLOC((uchar_t)-1, IPF_LOCK_PL, (lkinfo_t *)-1, KM_NOSLEEP);
ipf_mutex.l = LOCK_ALLOC((uchar_t)-1, IPF_LOCK_PL, (lkinfo_t *)-1, KM_NOSLEEP);
ipf_frcache.l = LOCK_ALLOC((uchar_t)-1, IPF_LOCK_PL, (lkinfo_t *)-1, KM_NOSLEEP);
ipf_timeoutlock.l = LOCK_ALLOC((uchar_t)-1, IPF_LOCK_PL, (lkinfo_t *)-1, KM_NOSLEEP);
ipf_global.l = LOCK_ALLOC((uchar_t)-1, IPF_LOCK_PL, (lkinfo_t *)-1, KM_NOSLEEP);
ipf_frag.l = LOCK_ALLOC((uchar_t)-1, IPF_LOCK_PL, (lkinfo_t *)-1, KM_NOSLEEP);
ipf_state.l = LOCK_ALLOC((uchar_t)-1, IPF_LOCK_PL, (lkinfo_t *)-1, KM_NOSLEEP);
ipf_nat.l = LOCK_ALLOC((uchar_t)-1, IPF_LOCK_PL, (lkinfo_t *)-1, KM_NOSLEEP);
ipf_stinsert.l = LOCK_ALLOC((uchar_t)-1, IPF_LOCK_PL, (lkinfo_t *)-1, KM_NOSLEEP);
ipf_natfrag.l = LOCK_ALLOC((uchar_t)-1, IPF_LOCK_PL, (lkinfo_t *)-1, KM_NOSLEEP);
ipf_ipidfrag.l = LOCK_ALLOC((uchar_t)-1, IPF_LOCK_PL, (lkinfo_t *)-1, KM_NOSLEEP);
ipf_tokens.l = LOCK_ALLOC((uchar_t)-1, IPF_LOCK_PL, (lkinfo_t *)-1, KM_NOSLEEP);
ipf_auth.l = LOCK_ALLOC((uchar_t)-1, IPF_LOCK_PL, (lkinfo_t *)-1, KM_NOSLEEP);
ipf_rw.l = LOCK_ALLOC((uchar_t)-1, IPF_LOCK_PL, (lkinfo_t *)-1, KM_NOSLEEP);
ipl_mutex.l = LOCK_ALLOC((uchar_t)-1, IPF_LOCK_PL, (lkinfo_t *)-1, KM_NOSLEEP);
if (!ipfi_mutex.l || !ipf_mutex.l || !ipf_timeoutlock.l ||
!ipf_frag.l || !ipf_state.l || !ipf_nat.l || !ipf_natfrag.l ||
!ipf_auth.l || !ipf_rw.l || !ipf_ipidfrag.l || !ipl_mutex.l ||
!ipf_stinsert.l || !ipf_auth_mx.l || !ipf_frcache.l ||
!ipf_tokens.l)
panic("IP Filter: LOCK_ALLOC failed");
#else
MUTEX_INIT(&ipf_rw, "ipf rw mutex");
MUTEX_INIT(&ipf_timeoutlock, "ipf timeout mutex");
RWLOCK_INIT(&ipf_global, "ipf filter load/unload mutex");
RWLOCK_INIT(&ipf_mutex, "ipf filter rwlock");
RWLOCK_INIT(&ipf_frcache, "ipf cache rwlock");
#endif
#ifdef IPFILTER_LKM
error = ipl_attach();
if (error) {
iplunload();
} else {
char *defpass;
if (FR_ISPASS(ipf_pass))
defpass = "pass";
else if (FR_ISBLOCK(ipf_pass))
defpass = "block";
else
defpass = "no-match -> block";
printf("%s initialized. Default = %s all, Logging = %s%s\n",
ipfilter_version, defpass,
# ifdef IPFILTER_LOG
"enabled",
# else
"disabled",
# endif
# ifdef IPFILTER_COMPILED
" (COMPILED)"
# else
""
# endif
);
}
#endif
return;
}