// L2TPNS PPP Stuff
-char const *cvs_id_ppp = "$Id: ppp.c,v 1.6 2004-06-28 02:43:13 fred_nerk Exp $";
+char const *cvs_id_ppp = "$Id: ppp.c,v 1.10 2004-08-02 05:40:21 fred_nerk Exp $";
#include <stdio.h>
#include <string.h>
extern tunnelt *tunnel;
extern sessiont *session;
extern radiust *radius;
-extern int tapfd;
+extern int tunfd;
extern char hostname[];
extern u32 eth_tx;
extern time_t time_now;
extern struct configt *config;
+void sendccp(tunnelidt t, sessionidt s);
+
// Process PAP messages
void processpap(tunnelidt t, sessionidt s, u8 * p, u16 l)
{
if (session[s].ip)
{
log(3, session[s].ip, s, t, "%d Already an IP allocated: %s (%d)\n", getpid(), inet_toa(htonl(session[s].ip)), session[s].ip_pool_index);
+ session[s].flags &= ~SF_IPCP_ACKED;
}
else
{
"EchoReq",
"EchoReply",
"DiscardRequest",
+ "IdentRequest",
};
void dumplcp(u8 *p, int l)
{
int type = o[0];
int length = o[1];
- if (length == 0)
+ if (length < 2)
{
- log(4, 0, 0, 0, " Option length is 0...\n");
+ log(4, 0, 0, 0, " Option length is %d...\n", length);
break;
}
if (type == 0)
switch (type)
{
case 1: // Maximum-Receive-Unit
+ if (length == 4)
log(4, 0, 0, 0, " %s %d\n", lcp_types[type], ntohs(*(u16 *)(o + 2)));
+ else
+ log(4, 0, 0, 0, " %s odd length %d\n", lcp_types[type], length);
break;
case 3: // Authentication-Protocol
{
+ if (length == 4)
+ {
int proto = ntohs(*(u16 *)(o + 2));
- log(4, 0, 0, 0, " %s %s\n", lcp_types[type],
- proto == 0xC223 ? "CHAP" : "PAP");
+ log(4, 0, 0, 0, " %s 0x%x (%s)\n", lcp_types[type], proto,
+ proto == 0xC223 ? "CHAP" :
+ proto == 0xC023 ? "PAP" : "UNKNOWN");
+ }
+ else
+ log(4, 0, 0, 0, " %s odd length %d\n", lcp_types[type], length);
break;
}
case 4: // Quality-Protocol
}
case 5: // Magic-Number
{
+ if (length == 6)
+ {
u32 magicno = ntohl(*(u32 *)(o + 2));
log(4, 0, 0, 0, " %s %x\n", lcp_types[type], magicno);
+ }
+ else
+ log(4, 0, 0, 0, " %s odd length %d\n", lcp_types[type], length);
break;
}
case 7: // Protocol-Field-Compression
{
- u32 pfc = ntohl(*(u32 *)(o + 2));
- log(4, 0, 0, 0, " %s %x\n", lcp_types[type], pfc);
+ log(4, 0, 0, 0, " %s\n", lcp_types[type]);
break;
}
case 8: // Address-And-Control-Field-Compression
{
- u32 afc = ntohl(*(u32 *)(o + 2));
- log(4, 0, 0, 0, " %s %x\n", lcp_types[type], afc);
+ log(4, 0, 0, 0, " %s\n", lcp_types[type]);
break;
}
default:
{
u8 b[MAXCONTROL];
u8 *q = NULL;
+ u32 magicno = 0;
CSTAT(call_processlcp);
if (*p == ConfigAck)
{
log(3, session[s].ip, s, t, "LCP: Discarding ConfigAck\n");
+ session[s].flags |= SESSIONLCPACK;
}
else if (*p == ConfigReq)
{
case 1: // Maximum-Receive-Unit
session[s].mru = ntohs(*(u16 *)(o + 2));
break;
+ case 2: // asyncmap
+ log_hex(2, "PPP LCP Packet", p, l);
+ log(2, 0, 0, 0, "PPP LCP Packet type %d (%s len %d)\n", *p, ppp_lcp_types[(int)*p], ntohs( ((u16 *) p)[1]) );
+ break;
case 3: // Authentication-Protocol
{
int proto = ntohs(*(u16 *)(o + 2));
}
case 5: // Magic-Number
{
-// u32 magicno = ntohl(*(u32 *)(o + 2));
+ magicno = ntohl(*(u32 *)(o + 2));
break;
}
case 4: // Quality-Protocol
- {
-// u32 qp = ntohl(*(u32 *)(o + 2));
- break;
- }
case 7: // Protocol-Field-Compression
- {
-// u32 pfc = ntohl(*(u32 *)(o + 2));
- break;
- }
case 8: // Address-And-Control-Field-Compression
- {
-// u32 afc = ntohl(*(u32 *)(o + 2));
break;
+ case 13: // CallBack option for LCP extention of win2000/routers L2TP client
+ case 17:
+ case 18:
+ {
+ // Reject LCP CallBack
+ log(2, session[s].ip, s, t, " PPP LCP Option type %d, len=%d\n", type, length);
+ memcpy(p + 4, o, length);
+ *(u16 *)(p + 2) = htons(length + 4);
+ *p = ConfigRej;
+ q = makeppp(b,sizeof(b), p, length + 4, t, s, PPPLCP);
+ tunnelsend(b, 12 + length + 4, t);
+ return;
}
+
default:
+ // Reject Unknown LCP Option to stop to send it again
log(2, session[s].ip, s, t, " Unknown PPP LCP Option type %d\n", type);
- break;
+ memcpy(p + 4, o, length);
+ *(u16 *)(p + 2) = htons(length + 4);
+ *p = ConfigRej;
+ q = makeppp(b,sizeof(b), p, length + 4, t, s, PPPLCP);
+ tunnelsend(b, 12 + length + 4, t);
+ return;
}
x -= length;
o += length;
}
*q = ConfigAck;
tunnelsend(b, l + (q - b), t);
+ // For win2k L2TP clients, LCP should be initiated by the LNS
+ if (magicno) initlcp(t, s);
}
else
{
// Already built a ConfigNak... send it
log(3, session[s].ip, s, t, "Sending ConfigNak\n");
tunnelsend(b, l + (q - b), t);
-
- log(3, session[s].ip, s, t, "Sending ConfigReq, requesting PAP login\n");
- q = makeppp(b, sizeof(b), NULL, 0, t, s, PPPLCP);
- *q++ = ConfigReq;
- *(u8 *)(q++) = 3;
- *(u8 *)(q++) = 4;
- *(u16 *)(q += 2) = htons(0xC023);
- tunnelsend(b, l + (q - b), t);
}
+
+ if (!(session[s].flags & SESSIONLCPACK))
+ initlcp(t, s);
}
else if (*p == ConfigNak)
{
sessionshutdown(s, "Remote end closed connection.");
tunnelsend(b, l + (q - b), t); // send it
}
- else if (*p == TerminateReq)
+ else if (*p == TerminateAck)
{
- sessionshutdown(s, "Remote end closed connection.");
+ sessionshutdown(s, "Connection closed.");
}
else if (*p == EchoReq)
{
{
// Ignore it, last_packet time is set earlier than this.
}
+ else if (*p == IdentRequest)
+ {
+ *p = CodeRej;
+ if (l > MAXCONTROL)
+ {
+ log(1, 0, s, t, "Truncated Ident Packet (length=%d) to 1400 bytes\n", l);
+ l = 1400;
+ }
+ q = makeppp(b, sizeof(b), p, l, t, s, PPPLCP);
+ if (!q)
+ {
+ log(3, session[s].ip, s, t, "Failed to create IdentRej.\n");
+ return;
+ }
+ log_hex(5, "LCPIdentRej", q, l + 4);
+ tunnelsend(b, 12 + 4 + l, t);
+ }
else
{
log(1, session[s].ip, s, t, "Unexpected LCP code %d\n", *p);
return ;
}
if (*p == ConfigAck)
- { // happy with our IPCP
+ {
+ // happy with our IPCP
u16 r = session[s].radius;
if ((!r || radius[r].state == RADIUSIPCP) && !session[s].walled_garden) {
if (!r)
}
session[s].flags |= SF_IPCP_ACKED;
- return ; // done
+ log(3, session[s].ip, s, t, "IPCP Acked, session is now active\n");
+ return;
}
if (*p != ConfigReq)
{
STAT(tunnel_rx_errors);
return ;
}
+ log(4, session[s].ip, s, t, "IPCP ConfigReq received\n");
if (ntohs(*(u16 *) (p + 2)) > l)
{
log(1, 0, s, t, "Length mismatch IPCP %d/%d\n", ntohs(*(u16 *) (p + 2)), l);
u8 *i,
*q;
+ l = ntohs(*(u16 *) (p + 2)); // We must use length from IPCP len field
q = p + 4;
i = p + l;
while (q < i && q[1])
q += q[1];
}
if (q < i)
- { // reject
+ {
+ // reject
u16 n = 4;
i = p + l;
- q = makeppp(b, sizeof(b), p, l, t, s, PPPIPCP);
- if (!q) {
- log(2, 0, s, t, "Failed to send IPCP.\n");
+ if (!(q = makeppp(b, sizeof(b), p, l, t, s, PPPIPCP)))
+ {
+ log(2, 0, s, t, "Failed to send IPCP ConfigRej\n");
return;
}
*q = ConfigRej;
p += p[1];
}
*(u16 *) (q + 2) = htons(n);
+ log(4, session[s].ip, s, t, "Sending ConfigRej\n");
tunnelsend(b, n + (q - b), t); // send it
}
else
{
+ log(4, session[s].ip, s, t, "Sending ConfigAck\n");
*p = ConfigAck;
- i = findppp(p, 0x81); // Primary DNS address
- if (i)
+ if ((i = findppp(p, 0x81))) // Primary DNS address
{
if (*(u32 *) (i + 2) != htonl(session[s].dns1))
{
*(u32 *) (i + 2) = htonl(session[s].dns1);
*p = ConfigNak;
+ log(5, session[s].ip, s, t, " DNS1 = %s\n", inet_toa(session[s].dns1));
}
}
- i = findppp(p, 0x83); // Secondary DNS address (TBA, is it)
- if (i)
+ if ((i = findppp(p, 0x83))) // Secondary DNS address (TBA, is it)
{
if (*(u32 *) (i + 2) != htonl(session[s].dns2))
{
*(u32 *) (i + 2) = htonl(session[s].dns2);
*p = ConfigNak;
+ log(5, session[s].ip, s, t, " DNS2 = %s\n", inet_toa(session[s].dns1));
}
}
i = findppp(p, 3); // IP address
{
*(u32 *) (i + 2) = htonl(session[s].ip);
*p = ConfigNak;
+ log(4, session[s].ip, s, t, " No, a ConfigNak, client is requesting IP - sending %s\n",
+ inet_toa(session[s].ip));
}
- q = makeppp(b, sizeof(b), p, l, t, s, PPPIPCP);
- if (!q) {
+ if (!(q = makeppp(b, sizeof(b), p, l, t, s, PPPIPCP)))
+ {
log(2, 0, s, t, " Failed to send IPCP packet.\n");
return;
}
// Snooping this session, send it to ASIO
snoop_send_packet(p, l, session[s].snoop_ip, session[s].snoop_port);
}
- STAT(tap_tx_packets);
- INC_STAT(tap_tx_bytes, l);
+ STAT(tun_tx_packets);
+ INC_STAT(tun_tx_bytes, l);
if (session[s].tbf_in && config->cluster_iam_master) { // Are we throttled and a master?? actually handle the throttled packets.
tbf_queue_packet(session[s].tbf_in, p, l);
// send to ethernet
if (tun_write(p, l) < 0)
{
- STAT(tap_tx_errors);
- log(0, 0, s, t, "Error writing %d bytes to TAP device: %s (tapfd=%d, p=%p)\n",
- l, strerror(errno), tapfd, p);
+ STAT(tun_tx_errors);
+ log(0, 0, s, t, "Error writing %d bytes to TUN device: %s (tunfd=%d, p=%p)\n",
+ l, strerror(errno), tunfd, p);
}
}
void send_ipin(sessionidt s, u8 *buf, int len)
{
log_hex(5, "IP in throttled", buf, len);
- if (write(tapfd, buf, len) < 0)
+ if (write(tunfd, buf, len) < 0)
{
- STAT(tap_tx_errors);
- log(0, 0, 0, 0, "Error writing %d bytes to TAP device: %s (tapfd=%d, p=%p)\n",
- len, strerror(errno), tapfd, buf);
+ STAT(tun_tx_errors);
+ log(0, 0, 0, 0, "Error writing %d bytes to TUN device: %s (tunfd=%d, p=%p)\n",
+ len, strerror(errno), tunfd, buf);
}
// Increment packet counters
else
{
*p = ConfigRej; // reject
+ sendccp(t, s);
}
}
else
*p = TerminateAck; // close
- q = makeppp(b, sizeof(b), p, l, t, s, PPPCCP);
- if (!q) {
+ if (!(q = makeppp(b, sizeof(b), p, l, t, s, PPPCCP)))
+ {
log(1,0,0,0, "Failed to send CCP packet.\n");
return;
}
*(u16 *) (b + 2) = htons(tunnel[t].far); // tunnel
*(u16 *) (b + 4) = htons(session[s].far); // session
b += 6;
- if (mtype != PPPLCP && !(session[s].l2tp_flags & SESSIONACFC))
+ if (mtype && !(session[s].l2tp_flags & SESSIONACFC))
{
*(u16 *) b = htons(0xFF03); // HDLC header
b += 2;
tunnelsend(b, 12 + 8, t);
}
+// Send CCP reply
+void sendccp(tunnelidt t, sessionidt s)
+{
+ char *q, b[500] = {0};
+
+ q = makeppp(b, sizeof(b), NULL, 0, t, s, PPPCCP);
+ *q = ConfigReq;
+ *(u8 *)(q + 1) = (time_now % 255) + 1; // ID
+ *(u16 *)(q + 2) = htons(4); // Length
+ log_hex(5, "PPPCCP", q, 4);
+ tunnelsend(b, (q - b) + 4 , t);
+}
+
projects / l2tpns.git / blobdiff