1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
|
/*
* $Id: ip_rcmd_pxy.c,v 1.4.2.6 2002/10/01 15:24:59 darrenr Exp $
*/
/*
* Simple RCMD transparent proxy for in-kernel use. For use with the NAT
* code.
*/
#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;
int off, dlen;
tcphdr_t *tcp, tcph, *tcp2 = &tcph;
fr_info_t fi;
u_short sp;
nat_t *ipn;
mb_t *m;
#if SOLARIS
mb_t *m1;
#endif
tcp = (tcphdr_t *)fin->fin_dp;
if (tcp->th_flags & TH_SYN) {
*(u_32_t *)aps->aps_data = htonl(ntohl(tcp->th_seq) + 1);
return 0;
}
if ((*(u_32_t *)aps->aps_data != 0) &&
(tcp->th_seq != *(u_32_t *)aps->aps_data))
return 0;
off = fin->fin_hlen + (tcp->th_off << 2);
#if SOLARIS
m = fin->fin_qfm;
dlen = msgdsize(m) - off;
bzero(portbuf, sizeof(portbuf));
copyout_mblk(m, off, MIN(sizeof(portbuf), dlen), portbuf);
#else
m = *(mb_t **)fin->fin_mp;
dlen = mbufchainlen(m) - off;
bzero(portbuf, sizeof(portbuf));
m_copydata(m, off, MIN(sizeof(portbuf), dlen), portbuf);
#endif
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.
*/
bcopy((char *)fin, (char *)&fi, sizeof(fi));
fi.fin_data[0] = sp;
fi.fin_data[1] = fin->fin_data[1];
ipn = nat_outlookup(&fi, IPN_TCP, nat->nat_p, nat->nat_inip,
ip->ip_dst, 0);
if (ipn == NULL) {
int slen;
slen = ip->ip_len;
ip->ip_len = fin->fin_hlen + sizeof(*tcp);
bzero((char *)tcp2, sizeof(*tcp2));
tcp2->th_win = htons(8192);
tcp2->th_sport = htons(sp);
tcp2->th_dport = 0; /* XXX - don't specify remote port */
tcp2->th_off = 5;
tcp2->th_flags = TH_SYN;
fi.fin_data[1] = 0;
fi.fin_dp = (char *)tcp2;
fi.fin_dlen = sizeof(*tcp2);
swip = ip->ip_src;
ip->ip_src = nat->nat_inip;
ipn = nat_new(&fi, ip, nat->nat_ptr, NULL, IPN_TCP|FI_W_DPORT,
NAT_OUTBOUND);
if (ipn != NULL) {
ipn->nat_age = fr_defnatage;
fi.fin_fr = &rcmdfr;
(void) fr_addstate(ip, &fi, NULL,
FI_W_DPORT|FI_IGNOREPKT);
}
ip->ip_len = slen;
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);
}
|