158 lines
3.2 KiB
C
158 lines
3.2 KiB
C
/*
|
|
* Simple RCMD transparent proxy for in-kernel use. For use with the NAT
|
|
* code.
|
|
* $FreeBSD$
|
|
*/
|
|
#if SOLARIS && defined(_KERNEL)
|
|
extern kmutex_t ipf_rw;
|
|
#endif
|
|
|
|
#define isdigit(x) ((x) >= '0' && (x) <= '9')
|
|
|
|
#define IPF_RCMD_PROXY
|
|
|
|
|
|
int ippr_rcmd_init __P((void));
|
|
int ippr_rcmd_new __P((fr_info_t *, ip_t *, ap_session_t *, nat_t *));
|
|
int ippr_rcmd_out __P((fr_info_t *, ip_t *, ap_session_t *, nat_t *));
|
|
u_short ipf_rcmd_atoi __P((char *));
|
|
int ippr_rcmd_portmsg __P((fr_info_t *, ip_t *, ap_session_t *, nat_t *));
|
|
|
|
static frentry_t rcmdfr;
|
|
|
|
|
|
/*
|
|
* RCMD application proxy initialization.
|
|
*/
|
|
int ippr_rcmd_init()
|
|
{
|
|
bzero((char *)&rcmdfr, sizeof(rcmdfr));
|
|
rcmdfr.fr_ref = 1;
|
|
rcmdfr.fr_flags = FR_INQUE|FR_PASS|FR_QUICK|FR_KEEPSTATE;
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*
|
|
* Setup for a new RCMD proxy.
|
|
*/
|
|
int ippr_rcmd_new(fin, ip, aps, nat)
|
|
fr_info_t *fin;
|
|
ip_t *ip;
|
|
ap_session_t *aps;
|
|
nat_t *nat;
|
|
{
|
|
tcphdr_t *tcp = (tcphdr_t *)fin->fin_dp;
|
|
|
|
aps->aps_psiz = sizeof(u_32_t);
|
|
KMALLOCS(aps->aps_data, u_32_t *, sizeof(u_32_t));
|
|
if (aps->aps_data == NULL)
|
|
return -1;
|
|
*(u_32_t *)aps->aps_data = 0;
|
|
aps->aps_sport = tcp->th_sport;
|
|
aps->aps_dport = tcp->th_dport;
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*
|
|
* ipf_rcmd_atoi - implement a simple version of atoi
|
|
*/
|
|
u_short ipf_rcmd_atoi(ptr)
|
|
char *ptr;
|
|
{
|
|
register char *s = ptr, c;
|
|
register u_short i = 0;
|
|
|
|
while ((c = *s++) && isdigit(c)) {
|
|
i *= 10;
|
|
i += c - '0';
|
|
}
|
|
return i;
|
|
}
|
|
|
|
|
|
int ippr_rcmd_portmsg(fin, ip, aps, nat)
|
|
fr_info_t *fin;
|
|
ip_t *ip;
|
|
ap_session_t *aps;
|
|
nat_t *nat;
|
|
{
|
|
char portbuf[8], *s;
|
|
struct in_addr swip;
|
|
u_short sp, dp;
|
|
int off, dlen;
|
|
tcphdr_t *tcp, tcph, *tcp2 = &tcph;
|
|
fr_info_t fi;
|
|
nat_t *ipn;
|
|
mb_t *m;
|
|
#if SOLARIS
|
|
mb_t *m1;
|
|
#endif
|
|
|
|
tcp = (tcphdr_t *)fin->fin_dp;
|
|
off = (ip->ip_hl << 2) + (tcp->th_off << 2);
|
|
m = *(mb_t **)fin->fin_mp;
|
|
|
|
#if SOLARIS
|
|
m = fin->fin_qfm;
|
|
|
|
dlen = msgdsize(m) - off;
|
|
bzero(portbuf, sizeof(portbuf));
|
|
copyout_mblk(m, off, MIN(sizeof(portbuf), dlen), portbuf);
|
|
#else
|
|
dlen = mbufchainlen(m) - off;
|
|
bzero(portbuf, sizeof(portbuf));
|
|
m_copydata(m, off, MIN(sizeof(portbuf), dlen), portbuf);
|
|
#endif
|
|
if ((*(u_32_t *)aps->aps_data != 0) &&
|
|
(tcp->th_seq != *(u_32_t *)aps->aps_data))
|
|
return 0;
|
|
|
|
portbuf[sizeof(portbuf) - 1] = '\0';
|
|
s = portbuf;
|
|
sp = ipf_rcmd_atoi(s);
|
|
if (!sp)
|
|
return 0;
|
|
|
|
/*
|
|
* Add skeleton NAT entry for connection which will come back the
|
|
* other way.
|
|
*/
|
|
sp = htons(sp);
|
|
dp = htons(fin->fin_data[1]);
|
|
ipn = nat_outlookup(fin->fin_ifp, IPN_TCP, nat->nat_p, nat->nat_inip,
|
|
ip->ip_dst, (dp << 16) | sp);
|
|
if (ipn == NULL) {
|
|
bcopy((char *)fin, (char *)&fi, sizeof(fi));
|
|
bzero((char *)tcp2, sizeof(*tcp2));
|
|
tcp2->th_win = htons(8192);
|
|
tcp2->th_sport = sp;
|
|
tcp2->th_dport = 0; /* XXX - don't specify remote port */
|
|
fi.fin_data[0] = ntohs(sp);
|
|
fi.fin_data[1] = 0;
|
|
fi.fin_dp = (char *)tcp2;
|
|
swip = ip->ip_src;
|
|
ip->ip_src = nat->nat_inip;
|
|
ipn = nat_new(nat->nat_ptr, ip, &fi, IPN_TCP|FI_W_DPORT,
|
|
NAT_OUTBOUND);
|
|
if (ipn != NULL) {
|
|
ipn->nat_age = fr_defnatage;
|
|
fi.fin_fr = &rcmdfr;
|
|
(void) fr_addstate(ip, &fi, FI_W_DPORT);
|
|
}
|
|
ip->ip_src = swip;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
int ippr_rcmd_out(fin, ip, aps, nat)
|
|
fr_info_t *fin;
|
|
ip_t *ip;
|
|
ap_session_t *aps;
|
|
nat_t *nat;
|
|
{
|
|
return ippr_rcmd_portmsg(fin, ip, aps, nat);
|
|
}
|