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|
/* $FreeBSD$ */
/*
* Copyright (C) 2012 by Darren Reed.
*
* See the IPFILTER.LICENCE file for details on licencing.
*/
#if !defined(lint)
static const char sccsid[] = "@(#)ip_fil.c 2.41 6/5/96 (C) 1993-2000 Darren Reed";
static const char rcsid[] = "@(#)$Id$";
#endif
#if defined(KERNEL) || defined(_KERNEL)
# undef KERNEL
# undef _KERNEL
# define KERNEL 1
# define _KERNEL 1
#endif
#if defined(__FreeBSD_version) && (__FreeBSD_version >= 400000) && \
!defined(KLD_MODULE) && !defined(IPFILTER_LKM)
# include "opt_inet6.h"
#endif
#if defined(__FreeBSD_version) && (__FreeBSD_version >= 440000) && \
!defined(KLD_MODULE) && !defined(IPFILTER_LKM)
# include "opt_random_ip_id.h"
#endif
#include <sys/param.h>
#include <sys/errno.h>
#include <sys/types.h>
#include <sys/file.h>
# include <sys/fcntl.h>
# include <sys/filio.h>
#include <sys/time.h>
#include <sys/systm.h>
# include <sys/dirent.h>
# include <sys/mbuf.h>
# include <sys/sockopt.h>
#if !defined(__hpux)
# include <sys/mbuf.h>
#endif
#include <sys/socket.h>
# include <sys/selinfo.h>
# include <netinet/tcp_var.h>
#include <net/if.h>
# include <net/if_var.h>
# include <net/netisr.h>
#include <net/route.h>
#include <netinet/in.h>
#include <netinet/in_var.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/ip_var.h>
#include <netinet/tcp.h>
#if defined(__osf__)
# include <netinet/tcp_timer.h>
#endif
#include <netinet/udp.h>
#include <netinet/tcpip.h>
#include <netinet/ip_icmp.h>
#include "netinet/ip_compat.h"
#ifdef USE_INET6
# include <netinet/icmp6.h>
#endif
#include "netinet/ip_fil.h"
#include "netinet/ip_nat.h"
#include "netinet/ip_frag.h"
#include "netinet/ip_state.h"
#include "netinet/ip_proxy.h"
#include "netinet/ip_auth.h"
#include "netinet/ip_sync.h"
#include "netinet/ip_lookup.h"
#include "netinet/ip_dstlist.h"
#ifdef IPFILTER_SCAN
#include "netinet/ip_scan.h"
#endif
#include "netinet/ip_pool.h"
# include <sys/malloc.h>
#include <sys/kernel.h>
#ifdef CSUM_DATA_VALID
#include <machine/in_cksum.h>
#endif
extern int ip_optcopy __P((struct ip *, struct ip *));
# ifdef IPFILTER_M_IPFILTER
MALLOC_DEFINE(M_IPFILTER, "ipfilter", "IP Filter packet filter data structures");
# endif
static u_short ipid = 0;
static int (*ipf_savep) __P((void *, ip_t *, int, void *, int, struct mbuf **));
static int ipf_send_ip __P((fr_info_t *, mb_t *));
static void ipf_timer_func __P((void *arg));
int ipf_locks_done = 0;
ipf_main_softc_t ipfmain;
# include <sys/conf.h>
# if defined(NETBSD_PF)
# include <net/pfil.h>
# endif /* NETBSD_PF */
/*
* We provide the ipf_checkp name just to minimize changes later.
*/
int (*ipf_checkp) __P((void *, ip_t *ip, int hlen, void *ifp, int out, mb_t **mp));
static eventhandler_tag ipf_arrivetag, ipf_departtag, ipf_clonetag;
static void ipf_ifevent(void *arg);
static void ipf_ifevent(arg)
void *arg;
{
ipf_sync(arg, NULL);
}
static int
ipf_check_wrapper(void *arg, struct mbuf **mp, struct ifnet *ifp, int dir)
{
struct ip *ip = mtod(*mp, struct ip *);
int rv;
/*
* IPFilter expects evreything in network byte order
*/
#if (__FreeBSD_version < 1000019)
ip->ip_len = htons(ip->ip_len);
ip->ip_off = htons(ip->ip_off);
#endif
rv = ipf_check(&ipfmain, ip, ip->ip_hl << 2, ifp, (dir == PFIL_OUT),
mp);
#if (__FreeBSD_version < 1000019)
if ((rv == 0) && (*mp != NULL)) {
ip = mtod(*mp, struct ip *);
ip->ip_len = ntohs(ip->ip_len);
ip->ip_off = ntohs(ip->ip_off);
}
#endif
return rv;
}
# ifdef USE_INET6
# include <netinet/ip6.h>
static int
ipf_check_wrapper6(void *arg, struct mbuf **mp, struct ifnet *ifp, int dir)
{
return (ipf_check(&ipfmain, mtod(*mp, struct ip *),
sizeof(struct ip6_hdr), ifp, (dir == PFIL_OUT), mp));
}
# endif
#if defined(IPFILTER_LKM)
int ipf_identify(s)
char *s;
{
if (strcmp(s, "ipl") == 0)
return 1;
return 0;
}
#endif /* IPFILTER_LKM */
static void
ipf_timer_func(arg)
void *arg;
{
ipf_main_softc_t *softc = arg;
SPL_INT(s);
SPL_NET(s);
READ_ENTER(&softc->ipf_global);
if (softc->ipf_running > 0)
ipf_slowtimer(softc);
if (softc->ipf_running == -1 || softc->ipf_running == 1) {
#if 0
softc->ipf_slow_ch = timeout(ipf_timer_func, softc, hz/2);
#endif
callout_init(&softc->ipf_slow_ch, CALLOUT_MPSAFE);
callout_reset(&softc->ipf_slow_ch,
(hz / IPF_HZ_DIVIDE) * IPF_HZ_MULT,
ipf_timer_func, softc);
}
RWLOCK_EXIT(&softc->ipf_global);
SPL_X(s);
}
int
ipfattach(softc)
ipf_main_softc_t *softc;
{
#ifdef USE_SPL
int s;
#endif
SPL_NET(s);
if (softc->ipf_running > 0) {
SPL_X(s);
return EBUSY;
}
if (ipf_init_all(softc) < 0) {
SPL_X(s);
return EIO;
}
if (ipf_checkp != ipf_check) {
ipf_savep = ipf_checkp;
ipf_checkp = ipf_check;
}
bzero((char *)ipfmain.ipf_selwait, sizeof(ipfmain.ipf_selwait));
softc->ipf_running = 1;
if (softc->ipf_control_forwarding & 1)
V_ipforwarding = 1;
ipid = 0;
SPL_X(s);
#if 0
softc->ipf_slow_ch = timeout(ipf_timer_func, softc,
(hz / IPF_HZ_DIVIDE) * IPF_HZ_MULT);
#endif
callout_init(&softc->ipf_slow_ch, CALLOUT_MPSAFE);
callout_reset(&softc->ipf_slow_ch, (hz / IPF_HZ_DIVIDE) * IPF_HZ_MULT,
ipf_timer_func, softc);
return 0;
}
/*
* Disable the filter by removing the hooks from the IP input/output
* stream.
*/
int
ipfdetach(softc)
ipf_main_softc_t *softc;
{
#ifdef USE_SPL
int s;
#endif
if (softc->ipf_control_forwarding & 2)
V_ipforwarding = 0;
SPL_NET(s);
#if 0
if (softc->ipf_slow_ch.callout != NULL)
untimeout(ipf_timer_func, softc, softc->ipf_slow_ch);
bzero(&softc->ipf_slow, sizeof(softc->ipf_slow));
#endif
callout_drain(&softc->ipf_slow_ch);
#ifndef NETBSD_PF
if (ipf_checkp != NULL)
ipf_checkp = ipf_savep;
ipf_savep = NULL;
#endif
ipf_fini_all(softc);
softc->ipf_running = -2;
SPL_X(s);
return 0;
}
/*
* Filter ioctl interface.
*/
int
ipfioctl(dev, cmd, data, mode
, p)
struct thread *p;
# define p_cred td_ucred
# define p_uid td_ucred->cr_ruid
struct cdev *dev;
ioctlcmd_t cmd;
caddr_t data;
int mode;
{
int error = 0, unit = 0;
SPL_INT(s);
#if (BSD >= 199306)
if (securelevel_ge(p->p_cred, 3) && (mode & FWRITE))
{
ipfmain.ipf_interror = 130001;
return EPERM;
}
#endif
unit = GET_MINOR(dev);
if ((IPL_LOGMAX < unit) || (unit < 0)) {
ipfmain.ipf_interror = 130002;
return ENXIO;
}
if (ipfmain.ipf_running <= 0) {
if (unit != IPL_LOGIPF && cmd != SIOCIPFINTERROR) {
ipfmain.ipf_interror = 130003;
return EIO;
}
if (cmd != SIOCIPFGETNEXT && cmd != SIOCIPFGET &&
cmd != SIOCIPFSET && cmd != SIOCFRENB &&
cmd != SIOCGETFS && cmd != SIOCGETFF &&
cmd != SIOCIPFINTERROR) {
ipfmain.ipf_interror = 130004;
return EIO;
}
}
SPL_NET(s);
error = ipf_ioctlswitch(&ipfmain, unit, data, cmd, mode, p->p_uid, p);
if (error != -1) {
SPL_X(s);
return error;
}
SPL_X(s);
return error;
}
/*
* ipf_send_reset - this could conceivably be a call to tcp_respond(), but that
* requires a large amount of setting up and isn't any more efficient.
*/
int
ipf_send_reset(fin)
fr_info_t *fin;
{
struct tcphdr *tcp, *tcp2;
int tlen = 0, hlen;
struct mbuf *m;
#ifdef USE_INET6
ip6_t *ip6;
#endif
ip_t *ip;
tcp = fin->fin_dp;
if (tcp->th_flags & TH_RST)
return -1; /* feedback loop */
if (ipf_checkl4sum(fin) == -1)
return -1;
tlen = fin->fin_dlen - (TCP_OFF(tcp) << 2) +
((tcp->th_flags & TH_SYN) ? 1 : 0) +
((tcp->th_flags & TH_FIN) ? 1 : 0);
#ifdef USE_INET6
hlen = (fin->fin_v == 6) ? sizeof(ip6_t) : sizeof(ip_t);
#else
hlen = sizeof(ip_t);
#endif
#ifdef MGETHDR
MGETHDR(m, M_DONTWAIT, MT_HEADER);
#else
MGET(m, M_DONTWAIT, MT_HEADER);
#endif
if (m == NULL)
return -1;
if (sizeof(*tcp2) + hlen > MLEN) {
MCLGET(m, M_DONTWAIT);
if ((m->m_flags & M_EXT) == 0) {
FREE_MB_T(m);
return -1;
}
}
m->m_len = sizeof(*tcp2) + hlen;
#if (BSD >= 199103)
m->m_data += max_linkhdr;
m->m_pkthdr.len = m->m_len;
m->m_pkthdr.rcvif = (struct ifnet *)0;
#endif
ip = mtod(m, struct ip *);
bzero((char *)ip, hlen);
#ifdef USE_INET6
ip6 = (ip6_t *)ip;
#endif
tcp2 = (struct tcphdr *)((char *)ip + hlen);
tcp2->th_sport = tcp->th_dport;
tcp2->th_dport = tcp->th_sport;
if (tcp->th_flags & TH_ACK) {
tcp2->th_seq = tcp->th_ack;
tcp2->th_flags = TH_RST;
tcp2->th_ack = 0;
} else {
tcp2->th_seq = 0;
tcp2->th_ack = ntohl(tcp->th_seq);
tcp2->th_ack += tlen;
tcp2->th_ack = htonl(tcp2->th_ack);
tcp2->th_flags = TH_RST|TH_ACK;
}
TCP_X2_A(tcp2, 0);
TCP_OFF_A(tcp2, sizeof(*tcp2) >> 2);
tcp2->th_win = tcp->th_win;
tcp2->th_sum = 0;
tcp2->th_urp = 0;
#ifdef USE_INET6
if (fin->fin_v == 6) {
ip6->ip6_flow = ((ip6_t *)fin->fin_ip)->ip6_flow;
ip6->ip6_plen = htons(sizeof(struct tcphdr));
ip6->ip6_nxt = IPPROTO_TCP;
ip6->ip6_hlim = 0;
ip6->ip6_src = fin->fin_dst6.in6;
ip6->ip6_dst = fin->fin_src6.in6;
tcp2->th_sum = in6_cksum(m, IPPROTO_TCP,
sizeof(*ip6), sizeof(*tcp2));
return ipf_send_ip(fin, m);
}
#endif
ip->ip_p = IPPROTO_TCP;
ip->ip_len = htons(sizeof(struct tcphdr));
ip->ip_src.s_addr = fin->fin_daddr;
ip->ip_dst.s_addr = fin->fin_saddr;
tcp2->th_sum = in_cksum(m, hlen + sizeof(*tcp2));
ip->ip_len = htons(hlen + sizeof(*tcp2));
return ipf_send_ip(fin, m);
}
/*
* ip_len must be in network byte order when called.
*/
static int
ipf_send_ip(fin, m)
fr_info_t *fin;
mb_t *m;
{
fr_info_t fnew;
ip_t *ip, *oip;
int hlen;
ip = mtod(m, ip_t *);
bzero((char *)&fnew, sizeof(fnew));
fnew.fin_main_soft = fin->fin_main_soft;
IP_V_A(ip, fin->fin_v);
switch (fin->fin_v)
{
case 4 :
oip = fin->fin_ip;
hlen = sizeof(*oip);
fnew.fin_v = 4;
fnew.fin_p = ip->ip_p;
fnew.fin_plen = ntohs(ip->ip_len);
IP_HL_A(ip, sizeof(*oip) >> 2);
ip->ip_tos = oip->ip_tos;
ip->ip_id = fin->fin_ip->ip_id;
#if defined(FreeBSD) && (__FreeBSD_version > 460000)
ip->ip_off = htons(path_mtu_discovery ? IP_DF : 0);
#else
ip->ip_off = 0;
#endif
ip->ip_ttl = V_ip_defttl;
ip->ip_sum = 0;
break;
#ifdef USE_INET6
case 6 :
{
ip6_t *ip6 = (ip6_t *)ip;
ip6->ip6_vfc = 0x60;
ip6->ip6_hlim = IPDEFTTL;
hlen = sizeof(*ip6);
fnew.fin_p = ip6->ip6_nxt;
fnew.fin_v = 6;
fnew.fin_plen = ntohs(ip6->ip6_plen) + hlen;
break;
}
#endif
default :
return EINVAL;
}
#ifdef IPSEC
m->m_pkthdr.rcvif = NULL;
#endif
fnew.fin_ifp = fin->fin_ifp;
fnew.fin_flx = FI_NOCKSUM;
fnew.fin_m = m;
fnew.fin_ip = ip;
fnew.fin_mp = &m;
fnew.fin_hlen = hlen;
fnew.fin_dp = (char *)ip + hlen;
(void) ipf_makefrip(hlen, ip, &fnew);
return ipf_fastroute(m, &m, &fnew, NULL);
}
int
ipf_send_icmp_err(type, fin, dst)
int type;
fr_info_t *fin;
int dst;
{
int err, hlen, xtra, iclen, ohlen, avail, code;
struct in_addr dst4;
struct icmp *icmp;
struct mbuf *m;
i6addr_t dst6;
void *ifp;
#ifdef USE_INET6
ip6_t *ip6;
#endif
ip_t *ip, *ip2;
if ((type < 0) || (type >= ICMP_MAXTYPE))
return -1;
code = fin->fin_icode;
#ifdef USE_INET6
#if 0
/* XXX Fix an off by one error: s/>/>=/
was:
if ((code < 0) || (code > sizeof(icmptoicmp6unreach)/sizeof(int)))
Fix obtained from NetBSD ip_fil_netbsd.c r1.4: */
#endif
if ((code < 0) || (code >= sizeof(icmptoicmp6unreach)/sizeof(int)))
return -1;
#endif
if (ipf_checkl4sum(fin) == -1)
return -1;
#ifdef MGETHDR
MGETHDR(m, M_DONTWAIT, MT_HEADER);
#else
MGET(m, M_DONTWAIT, MT_HEADER);
#endif
if (m == NULL)
return -1;
avail = MHLEN;
xtra = 0;
hlen = 0;
ohlen = 0;
dst4.s_addr = 0;
ifp = fin->fin_ifp;
if (fin->fin_v == 4) {
if ((fin->fin_p == IPPROTO_ICMP) && !(fin->fin_flx & FI_SHORT))
switch (ntohs(fin->fin_data[0]) >> 8)
{
case ICMP_ECHO :
case ICMP_TSTAMP :
case ICMP_IREQ :
case ICMP_MASKREQ :
break;
default :
FREE_MB_T(m);
return 0;
}
if (dst == 0) {
if (ipf_ifpaddr(&ipfmain, 4, FRI_NORMAL, ifp,
&dst6, NULL) == -1) {
FREE_MB_T(m);
return -1;
}
dst4 = dst6.in4;
} else
dst4.s_addr = fin->fin_daddr;
hlen = sizeof(ip_t);
ohlen = fin->fin_hlen;
iclen = hlen + offsetof(struct icmp, icmp_ip) + ohlen;
if (fin->fin_hlen < fin->fin_plen)
xtra = MIN(fin->fin_dlen, 8);
else
xtra = 0;
}
#ifdef USE_INET6
else if (fin->fin_v == 6) {
hlen = sizeof(ip6_t);
ohlen = sizeof(ip6_t);
iclen = hlen + offsetof(struct icmp, icmp_ip) + ohlen;
type = icmptoicmp6types[type];
if (type == ICMP6_DST_UNREACH)
code = icmptoicmp6unreach[code];
if (iclen + max_linkhdr + fin->fin_plen > avail) {
MCLGET(m, M_DONTWAIT);
if ((m->m_flags & M_EXT) == 0) {
FREE_MB_T(m);
return -1;
}
avail = MCLBYTES;
}
xtra = MIN(fin->fin_plen, avail - iclen - max_linkhdr);
xtra = MIN(xtra, IPV6_MMTU - iclen);
if (dst == 0) {
if (ipf_ifpaddr(&ipfmain, 6, FRI_NORMAL, ifp,
&dst6, NULL) == -1) {
FREE_MB_T(m);
return -1;
}
} else
dst6 = fin->fin_dst6;
}
#endif
else {
FREE_MB_T(m);
return -1;
}
avail -= (max_linkhdr + iclen);
if (avail < 0) {
FREE_MB_T(m);
return -1;
}
if (xtra > avail)
xtra = avail;
iclen += xtra;
m->m_data += max_linkhdr;
m->m_pkthdr.rcvif = (struct ifnet *)0;
m->m_pkthdr.len = iclen;
m->m_len = iclen;
ip = mtod(m, ip_t *);
icmp = (struct icmp *)((char *)ip + hlen);
ip2 = (ip_t *)&icmp->icmp_ip;
icmp->icmp_type = type;
icmp->icmp_code = fin->fin_icode;
icmp->icmp_cksum = 0;
#ifdef icmp_nextmtu
if (type == ICMP_UNREACH && fin->fin_icode == ICMP_UNREACH_NEEDFRAG) {
if (fin->fin_mtu != 0) {
icmp->icmp_nextmtu = htons(fin->fin_mtu);
} else if (ifp != NULL) {
icmp->icmp_nextmtu = htons(GETIFMTU_4(ifp));
} else { /* make up a number... */
icmp->icmp_nextmtu = htons(fin->fin_plen - 20);
}
}
#endif
bcopy((char *)fin->fin_ip, (char *)ip2, ohlen);
#ifdef USE_INET6
ip6 = (ip6_t *)ip;
if (fin->fin_v == 6) {
ip6->ip6_flow = ((ip6_t *)fin->fin_ip)->ip6_flow;
ip6->ip6_plen = htons(iclen - hlen);
ip6->ip6_nxt = IPPROTO_ICMPV6;
ip6->ip6_hlim = 0;
ip6->ip6_src = dst6.in6;
ip6->ip6_dst = fin->fin_src6.in6;
if (xtra > 0)
bcopy((char *)fin->fin_ip + ohlen,
(char *)&icmp->icmp_ip + ohlen, xtra);
icmp->icmp_cksum = in6_cksum(m, IPPROTO_ICMPV6,
sizeof(*ip6), iclen - hlen);
} else
#endif
{
ip->ip_p = IPPROTO_ICMP;
ip->ip_src.s_addr = dst4.s_addr;
ip->ip_dst.s_addr = fin->fin_saddr;
if (xtra > 0)
bcopy((char *)fin->fin_ip + ohlen,
(char *)&icmp->icmp_ip + ohlen, xtra);
icmp->icmp_cksum = ipf_cksum((u_short *)icmp,
sizeof(*icmp) + 8);
ip->ip_len = htons(iclen);
ip->ip_p = IPPROTO_ICMP;
}
err = ipf_send_ip(fin, m);
return err;
}
/*
* m0 - pointer to mbuf where the IP packet starts
* mpp - pointer to the mbuf pointer that is the start of the mbuf chain
*/
int
ipf_fastroute(m0, mpp, fin, fdp)
mb_t *m0, **mpp;
fr_info_t *fin;
frdest_t *fdp;
{
register struct ip *ip, *mhip;
register struct mbuf *m = *mpp;
register struct route *ro;
int len, off, error = 0, hlen, code;
struct ifnet *ifp, *sifp;
struct sockaddr_in *dst;
struct route iproute;
u_short ip_off;
frdest_t node;
frentry_t *fr;
ro = NULL;
#ifdef M_WRITABLE
/*
* HOT FIX/KLUDGE:
*
* If the mbuf we're about to send is not writable (because of
* a cluster reference, for example) we'll need to make a copy
* of it since this routine modifies the contents.
*
* If you have non-crappy network hardware that can transmit data
* from the mbuf, rather than making a copy, this is gonna be a
* problem.
*/
if (M_WRITABLE(m) == 0) {
m0 = m_dup(m, M_DONTWAIT);
if (m0 != 0) {
FREE_MB_T(m);
m = m0;
*mpp = m;
} else {
error = ENOBUFS;
FREE_MB_T(m);
goto done;
}
}
#endif
#ifdef USE_INET6
if (fin->fin_v == 6) {
/*
* currently "to <if>" and "to <if>:ip#" are not supported
* for IPv6
*/
return ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL);
}
#endif
hlen = fin->fin_hlen;
ip = mtod(m0, struct ip *);
ifp = NULL;
/*
* Route packet.
*/
ro = &iproute;
bzero(ro, sizeof (*ro));
dst = (struct sockaddr_in *)&ro->ro_dst;
dst->sin_family = AF_INET;
dst->sin_addr = ip->ip_dst;
fr = fin->fin_fr;
if ((fr != NULL) && !(fr->fr_flags & FR_KEEPSTATE) && (fdp != NULL) &&
(fdp->fd_type == FRD_DSTLIST)) {
if (ipf_dstlist_select_node(fin, fdp->fd_ptr, NULL, &node) == 0)
fdp = &node;
}
if (fdp != NULL)
ifp = fdp->fd_ptr;
else
ifp = fin->fin_ifp;
if ((ifp == NULL) && ((fr == NULL) || !(fr->fr_flags & FR_FASTROUTE))) {
error = -2;
goto bad;
}
if ((fdp != NULL) && (fdp->fd_ip.s_addr != 0))
dst->sin_addr = fdp->fd_ip;
dst->sin_len = sizeof(*dst);
in_rtalloc(ro, 0);
if ((ifp == NULL) && (ro->ro_rt != NULL))
ifp = ro->ro_rt->rt_ifp;
if ((ro->ro_rt == NULL) || (ifp == NULL)) {
if (in_localaddr(ip->ip_dst))
error = EHOSTUNREACH;
else
error = ENETUNREACH;
goto bad;
}
if (ro->ro_rt->rt_flags & RTF_GATEWAY)
dst = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
if (ro->ro_rt)
ro->ro_rt->rt_use++;
/*
* For input packets which are being "fastrouted", they won't
* go back through output filtering and miss their chance to get
* NAT'd and counted. Duplicated packets aren't considered to be
* part of the normal packet stream, so do not NAT them or pass
* them through stateful checking, etc.
*/
if ((fdp != &fr->fr_dif) && (fin->fin_out == 0)) {
sifp = fin->fin_ifp;
fin->fin_ifp = ifp;
fin->fin_out = 1;
(void) ipf_acctpkt(fin, NULL);
fin->fin_fr = NULL;
if (!fr || !(fr->fr_flags & FR_RETMASK)) {
u_32_t pass;
(void) ipf_state_check(fin, &pass);
}
switch (ipf_nat_checkout(fin, NULL))
{
case 0 :
break;
case 1 :
ip->ip_sum = 0;
break;
case -1 :
error = -1;
goto bad;
break;
}
fin->fin_ifp = sifp;
fin->fin_out = 0;
} else
ip->ip_sum = 0;
/*
* If small enough for interface, can just send directly.
*/
if (ntohs(ip->ip_len) <= ifp->if_mtu) {
if (!ip->ip_sum)
ip->ip_sum = in_cksum(m, hlen);
error = (*ifp->if_output)(ifp, m, (struct sockaddr *)dst,
ro
);
goto done;
}
/*
* Too large for interface; fragment if possible.
* Must be able to put at least 8 bytes per fragment.
*/
ip_off = ntohs(ip->ip_off);
if (ip_off & IP_DF) {
error = EMSGSIZE;
goto bad;
}
len = (ifp->if_mtu - hlen) &~ 7;
if (len < 8) {
error = EMSGSIZE;
goto bad;
}
{
int mhlen, firstlen = len;
struct mbuf **mnext = &m->m_act;
/*
* Loop through length of segment after first fragment,
* make new header and copy data of each part and link onto chain.
*/
m0 = m;
mhlen = sizeof (struct ip);
for (off = hlen + len; off < ntohs(ip->ip_len); off += len) {
#ifdef MGETHDR
MGETHDR(m, M_DONTWAIT, MT_HEADER);
#else
MGET(m, M_DONTWAIT, MT_HEADER);
#endif
if (m == 0) {
m = m0;
error = ENOBUFS;
goto bad;
}
m->m_data += max_linkhdr;
mhip = mtod(m, struct ip *);
bcopy((char *)ip, (char *)mhip, sizeof(*ip));
if (hlen > sizeof (struct ip)) {
mhlen = ip_optcopy(ip, mhip) + sizeof (struct ip);
IP_HL_A(mhip, mhlen >> 2);
}
m->m_len = mhlen;
mhip->ip_off = ((off - hlen) >> 3) + ip_off;
if (off + len >= ntohs(ip->ip_len))
len = ntohs(ip->ip_len) - off;
else
mhip->ip_off |= IP_MF;
mhip->ip_len = htons((u_short)(len + mhlen));
*mnext = m;
m->m_next = m_copy(m0, off, len);
if (m->m_next == 0) {
error = ENOBUFS; /* ??? */
goto sendorfree;
}
m->m_pkthdr.len = mhlen + len;
m->m_pkthdr.rcvif = NULL;
mhip->ip_off = htons((u_short)mhip->ip_off);
mhip->ip_sum = 0;
mhip->ip_sum = in_cksum(m, mhlen);
mnext = &m->m_act;
}
/*
* Update first fragment by trimming what's been copied out
* and updating header, then send each fragment (in order).
*/
m_adj(m0, hlen + firstlen - ip->ip_len);
ip->ip_len = htons((u_short)(hlen + firstlen));
ip->ip_off = htons((u_short)IP_MF);
ip->ip_sum = 0;
ip->ip_sum = in_cksum(m0, hlen);
sendorfree:
for (m = m0; m; m = m0) {
m0 = m->m_act;
m->m_act = 0;
if (error == 0)
error = (*ifp->if_output)(ifp, m,
(struct sockaddr *)dst,
ro
);
else
FREE_MB_T(m);
}
}
done:
if (!error)
ipfmain.ipf_frouteok[0]++;
else
ipfmain.ipf_frouteok[1]++;
if ((ro != NULL) && (ro->ro_rt != NULL)) {
RTFREE(ro->ro_rt);
}
return 0;
bad:
if (error == EMSGSIZE) {
sifp = fin->fin_ifp;
code = fin->fin_icode;
fin->fin_icode = ICMP_UNREACH_NEEDFRAG;
fin->fin_ifp = ifp;
(void) ipf_send_icmp_err(ICMP_UNREACH, fin, 1);
fin->fin_ifp = sifp;
fin->fin_icode = code;
}
FREE_MB_T(m);
goto done;
}
int
ipf_verifysrc(fin)
fr_info_t *fin;
{
struct sockaddr_in *dst;
struct route iproute;
bzero((char *)&iproute, sizeof(iproute));
dst = (struct sockaddr_in *)&iproute.ro_dst;
dst->sin_len = sizeof(*dst);
dst->sin_family = AF_INET;
dst->sin_addr = fin->fin_src;
in_rtalloc(&iproute, 0);
if (iproute.ro_rt == NULL)
return 0;
return (fin->fin_ifp == iproute.ro_rt->rt_ifp);
}
/*
* return the first IP Address associated with an interface
*/
int
ipf_ifpaddr(softc, v, atype, ifptr, inp, inpmask)
ipf_main_softc_t *softc;
int v, atype;
void *ifptr;
i6addr_t *inp, *inpmask;
{
#ifdef USE_INET6
struct in6_addr *inp6 = NULL;
#endif
struct sockaddr *sock, *mask;
struct sockaddr_in *sin;
struct ifaddr *ifa;
struct ifnet *ifp;
if ((ifptr == NULL) || (ifptr == (void *)-1))
return -1;
sin = NULL;
ifp = ifptr;
if (v == 4)
inp->in4.s_addr = 0;
#ifdef USE_INET6
else if (v == 6)
bzero((char *)inp, sizeof(*inp));
#endif
ifa = TAILQ_FIRST(&ifp->if_addrhead);
sock = ifa->ifa_addr;
while (sock != NULL && ifa != NULL) {
sin = (struct sockaddr_in *)sock;
if ((v == 4) && (sin->sin_family == AF_INET))
break;
#ifdef USE_INET6
if ((v == 6) && (sin->sin_family == AF_INET6)) {
inp6 = &((struct sockaddr_in6 *)sin)->sin6_addr;
if (!IN6_IS_ADDR_LINKLOCAL(inp6) &&
!IN6_IS_ADDR_LOOPBACK(inp6))
break;
}
#endif
ifa = TAILQ_NEXT(ifa, ifa_link);
if (ifa != NULL)
sock = ifa->ifa_addr;
}
if (ifa == NULL || sin == NULL)
return -1;
mask = ifa->ifa_netmask;
if (atype == FRI_BROADCAST)
sock = ifa->ifa_broadaddr;
else if (atype == FRI_PEERADDR)
sock = ifa->ifa_dstaddr;
if (sock == NULL)
return -1;
#ifdef USE_INET6
if (v == 6) {
return ipf_ifpfillv6addr(atype, (struct sockaddr_in6 *)sock,
(struct sockaddr_in6 *)mask,
inp, inpmask);
}
#endif
return ipf_ifpfillv4addr(atype, (struct sockaddr_in *)sock,
(struct sockaddr_in *)mask,
&inp->in4, &inpmask->in4);
}
u_32_t
ipf_newisn(fin)
fr_info_t *fin;
{
u_32_t newiss;
newiss = arc4random();
return newiss;
}
/* ------------------------------------------------------------------------ */
/* Function: ipf_nextipid */
/* Returns: int - 0 == success, -1 == error (packet should be droppped) */
/* Parameters: fin(I) - pointer to packet information */
/* */
/* Returns the next IPv4 ID to use for this packet. */
/* ------------------------------------------------------------------------ */
u_short
ipf_nextipid(fin)
fr_info_t *fin;
{
u_short id;
#ifndef RANDOM_IP_ID
MUTEX_ENTER(&ipfmain.ipf_rw);
id = ipid++;
MUTEX_EXIT(&ipfmain.ipf_rw);
#else
id = ip_randomid();
#endif
return id;
}
INLINE int
ipf_checkv4sum(fin)
fr_info_t *fin;
{
#ifdef CSUM_DATA_VALID
int manual = 0;
u_short sum;
ip_t *ip;
mb_t *m;
if ((fin->fin_flx & FI_NOCKSUM) != 0)
return 0;
if ((fin->fin_flx & FI_SHORT) != 0)
return 1;
if (fin->fin_cksum != FI_CK_NEEDED)
return (fin->fin_cksum > FI_CK_NEEDED) ? 0 : -1;
m = fin->fin_m;
if (m == NULL) {
manual = 1;
goto skipauto;
}
ip = fin->fin_ip;
if ((m->m_pkthdr.csum_flags & (CSUM_IP_CHECKED|CSUM_IP_VALID)) ==
CSUM_IP_CHECKED) {
fin->fin_cksum = FI_CK_BAD;
fin->fin_flx |= FI_BAD;
return -1;
}
if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) {
if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR)
sum = m->m_pkthdr.csum_data;
else
sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr,
htonl(m->m_pkthdr.csum_data +
fin->fin_dlen + fin->fin_p));
sum ^= 0xffff;
if (sum != 0) {
fin->fin_cksum = FI_CK_BAD;
fin->fin_flx |= FI_BAD;
} else {
fin->fin_cksum = FI_CK_SUMOK;
return 0;
}
} else {
if (m->m_pkthdr.csum_flags == CSUM_DELAY_DATA) {
fin->fin_cksum = FI_CK_L4FULL;
return 0;
} else if (m->m_pkthdr.csum_flags == CSUM_TCP ||
m->m_pkthdr.csum_flags == CSUM_UDP) {
fin->fin_cksum = FI_CK_L4PART;
return 0;
} else if (m->m_pkthdr.csum_flags == CSUM_IP) {
fin->fin_cksum = FI_CK_L4PART;
return 0;
} else {
manual = 1;
}
}
skipauto:
if (manual != 0) {
if (ipf_checkl4sum(fin) == -1) {
fin->fin_flx |= FI_BAD;
return -1;
}
}
#else
if (ipf_checkl4sum(fin) == -1) {
fin->fin_flx |= FI_BAD;
return -1;
}
#endif
return 0;
}
#ifdef USE_INET6
INLINE int
ipf_checkv6sum(fin)
fr_info_t *fin;
{
if ((fin->fin_flx & FI_NOCKSUM) != 0)
return 0;
if ((fin->fin_flx & FI_SHORT) != 0)
return 1;
if (fin->fin_cksum != FI_CK_NEEDED)
return (fin->fin_cksum > FI_CK_NEEDED) ? 0 : -1;
if (ipf_checkl4sum(fin) == -1) {
fin->fin_flx |= FI_BAD;
return -1;
}
return 0;
}
#endif /* USE_INET6 */
size_t
mbufchainlen(m0)
struct mbuf *m0;
{
size_t len;
if ((m0->m_flags & M_PKTHDR) != 0) {
len = m0->m_pkthdr.len;
} else {
struct mbuf *m;
for (m = m0, len = 0; m != NULL; m = m->m_next)
len += m->m_len;
}
return len;
}
/* ------------------------------------------------------------------------ */
/* Function: ipf_pullup */
/* Returns: NULL == pullup failed, else pointer to protocol header */
/* Parameters: xmin(I)- pointer to buffer where data packet starts */
/* fin(I) - pointer to packet information */
/* len(I) - number of bytes to pullup */
/* */
/* Attempt to move at least len bytes (from the start of the buffer) into a */
/* single buffer for ease of access. Operating system native functions are */
/* used to manage buffers - if necessary. If the entire packet ends up in */
/* a single buffer, set the FI_COALESCE flag even though ipf_coalesce() has */
/* not been called. Both fin_ip and fin_dp are updated before exiting _IF_ */
/* and ONLY if the pullup succeeds. */
/* */
/* We assume that 'xmin' is a pointer to a buffer that is part of the chain */
/* of buffers that starts at *fin->fin_mp. */
/* ------------------------------------------------------------------------ */
void *
ipf_pullup(xmin, fin, len)
mb_t *xmin;
fr_info_t *fin;
int len;
{
int dpoff, ipoff;
mb_t *m = xmin;
char *ip;
if (m == NULL)
return NULL;
ip = (char *)fin->fin_ip;
if ((fin->fin_flx & FI_COALESCE) != 0)
return ip;
ipoff = fin->fin_ipoff;
if (fin->fin_dp != NULL)
dpoff = (char *)fin->fin_dp - (char *)ip;
else
dpoff = 0;
if (M_LEN(m) < len) {
mb_t *n = *fin->fin_mp;
/*
* Assume that M_PKTHDR is set and just work with what is left
* rather than check..
* Should not make any real difference, anyway.
*/
if (m != n) {
/*
* Record the mbuf that points to the mbuf that we're
* about to go to work on so that we can update the
* m_next appropriately later.
*/
for (; n->m_next != m; n = n->m_next)
;
} else {
n = NULL;
}
#ifdef MHLEN
if (len > MHLEN)
#else
if (len > MLEN)
#endif
{
#ifdef HAVE_M_PULLDOWN
if (m_pulldown(m, 0, len, NULL) == NULL)
m = NULL;
#else
FREE_MB_T(*fin->fin_mp);
m = NULL;
n = NULL;
#endif
} else
{
m = m_pullup(m, len);
}
if (n != NULL)
n->m_next = m;
if (m == NULL) {
/*
* When n is non-NULL, it indicates that m pointed to
* a sub-chain (tail) of the mbuf and that the head
* of this chain has not yet been free'd.
*/
if (n != NULL) {
FREE_MB_T(*fin->fin_mp);
}
*fin->fin_mp = NULL;
fin->fin_m = NULL;
return NULL;
}
if (n == NULL)
*fin->fin_mp = m;
while (M_LEN(m) == 0) {
m = m->m_next;
}
fin->fin_m = m;
ip = MTOD(m, char *) + ipoff;
fin->fin_ip = (ip_t *)ip;
if (fin->fin_dp != NULL)
fin->fin_dp = (char *)fin->fin_ip + dpoff;
if (fin->fin_fraghdr != NULL)
fin->fin_fraghdr = (char *)ip +
((char *)fin->fin_fraghdr -
(char *)fin->fin_ip);
}
if (len == fin->fin_plen)
fin->fin_flx |= FI_COALESCE;
return ip;
}
int
ipf_inject(fin, m)
fr_info_t *fin;
mb_t *m;
{
int error = 0;
if (fin->fin_out == 0) {
netisr_dispatch(NETISR_IP, m);
} else {
fin->fin_ip->ip_len = ntohs(fin->fin_ip->ip_len);
fin->fin_ip->ip_off = ntohs(fin->fin_ip->ip_off);
error = ip_output(m, NULL, NULL, IP_FORWARDING, NULL, NULL);
}
return error;
}
int ipf_pfil_unhook(void) {
#if defined(NETBSD_PF) && (__FreeBSD_version >= 500011)
struct pfil_head *ph_inet;
# ifdef USE_INET6
struct pfil_head *ph_inet6;
# endif
#endif
#ifdef NETBSD_PF
ph_inet = pfil_head_get(PFIL_TYPE_AF, AF_INET);
if (ph_inet != NULL)
pfil_remove_hook((void *)ipf_check_wrapper, NULL,
PFIL_IN|PFIL_OUT|PFIL_WAITOK, ph_inet);
# ifdef USE_INET6
ph_inet6 = pfil_head_get(PFIL_TYPE_AF, AF_INET6);
if (ph_inet6 != NULL)
pfil_remove_hook((void *)ipf_check_wrapper6, NULL,
PFIL_IN|PFIL_OUT|PFIL_WAITOK, ph_inet6);
# endif
#endif
return (0);
}
int ipf_pfil_hook(void) {
#if defined(NETBSD_PF) && (__FreeBSD_version >= 500011)
struct pfil_head *ph_inet;
# ifdef USE_INET6
struct pfil_head *ph_inet6;
# endif
#endif
# ifdef NETBSD_PF
ph_inet = pfil_head_get(PFIL_TYPE_AF, AF_INET);
# ifdef USE_INET6
ph_inet6 = pfil_head_get(PFIL_TYPE_AF, AF_INET6);
# endif
if (ph_inet == NULL
# ifdef USE_INET6
&& ph_inet6 == NULL
# endif
) {
return ENODEV;
}
if (ph_inet != NULL)
pfil_add_hook((void *)ipf_check_wrapper, NULL,
PFIL_IN|PFIL_OUT|PFIL_WAITOK, ph_inet);
# ifdef USE_INET6
if (ph_inet6 != NULL)
pfil_add_hook((void *)ipf_check_wrapper6, NULL,
PFIL_IN|PFIL_OUT|PFIL_WAITOK, ph_inet6);
# endif
# endif
return (0);
}
void
ipf_event_reg(void)
{
ipf_arrivetag = EVENTHANDLER_REGISTER(ifnet_arrival_event, \
ipf_ifevent, &ipfmain, \
EVENTHANDLER_PRI_ANY);
ipf_departtag = EVENTHANDLER_REGISTER(ifnet_departure_event, \
ipf_ifevent, &ipfmain, \
EVENTHANDLER_PRI_ANY);
ipf_clonetag = EVENTHANDLER_REGISTER(if_clone_event, ipf_ifevent, \
&ipfmain, EVENTHANDLER_PRI_ANY);
}
void
ipf_event_dereg(void)
{
if (ipf_arrivetag != NULL) {
EVENTHANDLER_DEREGISTER(ifnet_arrival_event, ipf_arrivetag);
}
if (ipf_departtag != NULL) {
EVENTHANDLER_DEREGISTER(ifnet_departure_event, ipf_departtag);
}
if (ipf_clonetag != NULL) {
EVENTHANDLER_DEREGISTER(if_clone_event, ipf_clonetag);
}
}
u_32_t
ipf_random()
{
return arc4random();
}
u_int
ipf_pcksum(fin, hlen, sum)
fr_info_t *fin;
int hlen;
u_int sum;
{
struct mbuf *m;
u_int sum2;
int off;
m = fin->fin_m;
off = (char *)fin->fin_dp - (char *)fin->fin_ip;
m->m_data += hlen;
m->m_len -= hlen;
sum2 = in_cksum(fin->fin_m, fin->fin_plen - off);
m->m_len += hlen;
m->m_data -= hlen;
/*
* Both sum and sum2 are partial sums, so combine them together.
*/
sum += ~sum2 & 0xffff;
while (sum > 0xffff)
sum = (sum & 0xffff) + (sum >> 16);
sum2 = ~sum & 0xffff;
return sum2;
}
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