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ip_fil_osf.c
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/*
* Copyright (C) 1993-2012 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
#include <sys/param.h>
#include <sys/errno.h>
#include <sys/types.h>
#include <sys/file.h>
#include <sys/ioctl.h>
#include <sys/time.h>
#include <sys/systm.h>
#include <sys/dir.h>
#include <sys/mbuf.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <net/if.h>
#include <net/radix.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>
#include <netinet/tcp_timer.h>
#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"
#ifdef IPFILTER_SCAN
#include "netinet/ip_scan.h"
#endif
/*
* It is important that these #define's only affect this .h file in here
* because we depend on the routing stuff getting the current names.
*/
#define radix_mask ipf_radix_mask
#define radix_node ipf_radix_node
#define radix_node_head ipf_radix_node_head
#undef radix_mask
#undef radix_node
#undef radix_node_head
#include "md5.h"
#include <sys/kernel.h>
extern int ip_optcopy(struct ip *, struct ip *);
extern int udp_ttl;
extern int ipdefttl;
extern int ipforwarding;
extern ipf_main_softc_t ipfmain;
/* #undef IPFDEBUG */
static int ipf_send_ip(fr_info_t *, mb_t *);
static u_short ipid = 0;
ipfmutex_t ipf_rw, ipl_mutex, ipf_auth_mx, ipf_timeoutlock;
ipfmutex_t ipf_nat_new, ipf_natio, ipf_stinsert;
ipfrwlock_t ipf_mutex, ipf_global, ipf_frag, ipf_tru64, ipf_frcache;
ipfrwlock_t ipf_state, ipf_nat, ipf_natfrag, ipf_authlk, ipf_ipidfrag;
ipfrwlock_t ipf_tokens;
int ipf_locks_done = 0;
#if defined(IPFILTER_LKM)
int
iplidentify(s)
char *s;
{
if (strcmp(s, "ipl") == 0)
return 1;
return 0;
}
#endif /* IPFILTER_LKM */
int
ipfattach(softc)
ipf_main_softc_t *softc;
{
int s, i;
SPL_NET(s);
if (softc->ipf_running > 0) {
printf("IP Filter: already initialized\n");
SPL_X(s);
return EBUSY;
}
if (ipf_init_all(softc) < 0) {
SPL_X(s);
#ifdef IPFDEBUG
printf("ipf_initialise() == %d\n", i);
#endif
return EIO;
}
if (softc->ipf_control_forwarding & 1)
ipforwarding = 1;
ipid = 0;
SPL_X(s);
return 0;
}
/*
* Disable the filter by removing the hooks from the IP input/output
* stream.
*/
int
ipfdetach(softc)
ipf_main_softc_t *softc;
{
int s;
if (softc->ipf_refcnt)
return EBUSY;
SPL_NET(s);
if (softc->ipf_control_forwarding & 2)
ipforwarding = 0;
ipf_fini_all(softc);
SPL_X(s);
return 0;
}
/*
* Filter ioctl interface.
*/
int
ipfioctl(dev, cmd, data, mode)
dev_t dev;
int cmd;
caddr_t data;
int mode;
{
int error = 0, unit = 0;
struct proc *p;
SPL_INT(s);
unit = 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 != (ioctlcmd_t)SIOCIPFGETNEXT &&
cmd != (ioctlcmd_t)SIOCIPFGET &&
cmd != (ioctlcmd_t)SIOCIPFSET &&
cmd != (ioctlcmd_t)SIOCFRENB &&
cmd != (ioctlcmd_t)SIOCGETFS &&
cmd != (ioctlcmd_t)SIOCGETFF &&
cmd != (ioctlcmd_t)SIOCIPFINTERROR) {
ipfmain.ipf_interror = 130004;
return EIO;
}
}
SPL_NET(s);
p = task_to_proc(current_task());
error = ipf_ioctlswitch(&ipfmain, unit, data, cmd, mode, p->p_ruid, 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 > MHLEN) {
MCLGET(m, M_DONTWAIT);
if ((m->m_flags & M_EXT) == 0) {
FREE_MB_T(m);
return -1;
}
}
m->m_len = sizeof(*tcp2) + hlen;
m->m_data += max_linkhdr;
m->m_pkthdr.len = m->m_len;
m->m_pkthdr.rcvif = (struct ifnet *)0;
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 = hlen + sizeof(*tcp2);
return ipf_send_ip(fin, m);
}
static int
ipf_send_ip(fin, m)
fr_info_t *fin;
mb_t *m;
{
fr_info_t fnew;
ip_t *ip, *oip;
int ttl, hlen;
ip = mtod(m, ip_t *);
bzero((char *)&fnew, sizeof(fnew));
fnew.fin_main_soft = fin->fin_main_soft;
switch (fin->fin_p)
{
case IPPROTO_TCP :
ttl = tcp_ttl;
break;
case IPPROTO_UDP :
ttl = udp_ttl;
break;
default :
ttl = ipdefttl;
break;
}
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 = ip->ip_len + hlen;
IP_HL_A(ip, sizeof(*oip) >> 2);
ip->ip_tos = oip->ip_tos;
ip->ip_id = fin->fin_ip->ip_id;
ip->ip_len = htons(ip->ip_len);
ip->ip_off = 0;
ip->ip_ttl = ttl;
ip->ip_sum = 0;
break;
#ifdef USE_INET6
case 6 :
{
ip6_t *ip6 = (ip6_t *)ip;
# if TRU64 <= 1885
ip6->ip6_vcf = 0x60;
# else
ip6->ip6_vfc = 0x60;
# endif
ip6->ip6_hlim = ttl;
hlen = sizeof(*ip6);
fnew.fin_p = ip6->ip6_nxt;
fnew.fin_v = 6;
fnew.fin_plen = ntohs(ip6->ip6_plen) + hlen;
}
#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);
if (fin->fin_fr != NULL && fin->fin_fr->fr_type == FR_T_IPF) {
frdest_t *fdp = &fin->fin_fr->fr_rif;
if ((fdp->fd_ptr != NULL) &&
(fdp->fd_ptr != (struct ifnet *)-1))
return ipf_fastroute(m, &m, &fnew, fdp);
}
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 = 0, xtra = 0, iclen, ohlen = 0, 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 ((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;
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);
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 (hlen + sizeof(*icmp) + 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);
m->m_data += max_linkhdr;
m->m_pkthdr.rcvif = (struct ifnet *)0;
if (xtra > avail)
xtra = avail;
iclen += xtra;
m->m_pkthdr.len = iclen;
if (avail < 0) {
FREE_MB_T(m);
return -1;
}
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 = iclen;
ip->ip_p = IPPROTO_ICMP;
}
err = ipf_send_ip(fin, m);
return err;
}
void iplinit(void);
void iplinit()
{
if (ipfattach(&ipfmain) != 0)
printf("IP Filter failed to attach\n");
ip_init();
}
/*
* 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)
struct mbuf *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;
ipf_main_softc_t *softc;
u_short ip_off, ip_len;
struct route iproute;
frdest_t node;
frentry_t *fr;
softc = fin->fin_main_soft;
#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) {
if ((m0 = m_dup(m, M_DONTWAIT)) != 0) {
FREE_MB_T(m);
m = m0;
*mpp = m;
} else {
error = ENOBUFS;
FREE_MB_T(m);
goto done;
}
}
#endif
hlen = fin->fin_hlen;
ip = mtod(m0, struct ip *);
#if 0 /* ifdef USE_INET6 */
if (fin->fin_v == 6) {
dst6->sin6_family = AF_INET6;
fr = fin->fin_fr;
if (fdp != NULL)
ifp = fdp->fd_ifp;
else {
ifp = fin->fin_ifp;
dst->sin6_addr = fin->fin_daddr6;
}
ip6tx.tx_mbuf = *mpp;
ip6tx.tx_ip6 = (ip6_t *)ip;
ip6tx.tx_ro = ro;
ip6tx.tx_if6 = NULL;
ip6tx.tx_nexthop = dst6;
ip6tx.tx_imo6 = NULL;
ip6tx.tx_pmtudisc = 0;
ip6tx.tx_dontroute = 0;
ip6tx.tx_rawoutput = 0;
ip6tx.tx_mtu = ifp->if_mtu;
ip6tx.tx_opt = NULL;
/*
* currently "to <if>" and "to <if>:ip#" are not supported
* for IPv6
*/
return ip6_output(&ip6tx);
}
# endif
/*
* Route packet.
*/
ro = &iproute;
bzero((caddr_t)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 ((fdp != NULL) && (fdp->fd_ip.s_addr != 0))
dst->sin_addr = fdp->fd_ip;
dst->sin_len = sizeof(*dst);
rtalloc(ro);
if (!ifp) {
if (!fr || !(fr->fr_flags & FR_FASTROUTE)) {
error = -2;
goto bad;
}
if (ro->ro_rt == 0 || (ifp = ro->ro_rt->rt_ifp) == 0) {
i6addr_t i6;
i6.in4 = ip->ip_dst;
if (in_localaddr(&i6.in6, ro->ro_rt))
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.
*/
ip_len = ntohs(ip->ip_len);
if (ip_len <= ifp->if_mtu) {
if (!ip->ip_sum)
ip->ip_sum = in_cksum(m, hlen);
#if TRU64 >= 1885
error = (*ifp->if_output)(ifp, m, (struct sockaddr *)dst,
ro->ro_rt, NULL);
#else
error = (*ifp->if_output)(ifp, m, (struct sockaddr *)dst,
ro->ro_rt);
#endif
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 < 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 >= ip_len)
len = ip_len - off;
else
mhip->ip_off |= IP_MF;
mhip->ip_len = htons((u_short)(len + mhlen));
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;
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_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)
#if TRU64 >= 1885
error = (*ifp->if_output)(ifp, m,
(struct sockaddr *)dst, ro->ro_rt, NULL);
#else
error = (*ifp->if_output)(ifp, m,
(struct sockaddr *)dst, ro->ro_rt);
#endif
else
FREE_MB_T(m);
}
}
done:
if (!error)
softc->ipf_frouteok[0]++;
else
softc->ipf_frouteok[1]++;
if (ro->ro_rt) {
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;
rtalloc(&iproute);
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 in_addr in;
struct ifnet *ifp;
if ((ifptr == NULL) || (ifptr == (void *)-1))
return -1;
ifp = ifptr;
if (v == 4)
inp->in4.s_addr = 0;
#ifdef USE_INET6
else if (v == 6)
bzero((char *)inp, sizeof(*inp));
#endif
ifa = ifp->if_addrlist;
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 = ifa->ifa_next;
if (ifa)
sock = ifa->ifa_addr;
}
if (ifa == NULL || sock == NULL)
return -1;
mask = ifa->ifa_netmask;
if (atype == FRI_BROADCAST)
sock = ifa->ifa_broadaddr;
else if (atype == FRI_PEERADDR)
sock = ifa->ifa_dstaddr;
#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;
{
static int iss_seq_off = 0;
ipf_main_softc_t *softc = fin->fin_main_soft;
u_char hash[16];
u_32_t newiss;
MD5_CTX ctx;
/*
* Compute the base value of the ISS. It is a hash
* of (saddr, sport, daddr, dport, secret).
*/
MD5Init(&ctx);
MD5Update(&ctx, (u_char *) &fin->fin_fi.fi_src,
sizeof(fin->fin_fi.fi_src));
MD5Update(&ctx, (u_char *) &fin->fin_fi.fi_dst,
sizeof(fin->fin_fi.fi_dst));
MD5Update(&ctx, (u_char *) &fin->fin_dat, sizeof(fin->fin_dat));
MD5Update(&ctx, softc->ipf_iss_secret, sizeof(softc->ipf_iss_secret));
MD5Final(hash, &ctx);
bcopy(hash, &newiss, sizeof(newiss));