// L2TPNS PPP Stuff
-char const *cvs_id_ppp = "$Id: ppp.c,v 1.28 2004/11/25 02:45:27 bodea Exp $";
+char const *cvs_id_ppp = "$Id: ppp.c,v 1.33 2004/11/29 02:17:18 bodea Exp $";
#include <stdio.h>
#include <string.h>
extern char hostname[];
extern u32 eth_tx;
extern time_t time_now;
-extern struct configt *config;
+extern configt *config;
+
+static void initccp(tunnelidt t, sessionidt s);
// Process PAP messages
void processpap(tunnelidt t, sessionidt s, u8 *p, u16 l)
LOG_HEX(5, "PAP", p, l);
if (l < 4)
{
- LOG(1, 0, s, t, "Short PAP %u bytes\n", l);
+ LOG(1, s, t, "Short PAP %u bytes\n", l);
STAT(tunnel_rx_errors);
return ;
}
if ((hl = ntohs(*(u16 *) (p + 2))) > l)
{
- LOG(1, 0, s, t, "Length mismatch PAP %u/%u\n", hl, l);
+ LOG(1, s, t, "Length mismatch PAP %u/%u\n", hl, l);
STAT(tunnel_rx_errors);
return ;
}
if (*p != 1)
{
- LOG(1, 0, s, t, "Unexpected PAP code %d\n", *p);
+ LOG(1, s, t, "Unexpected PAP code %d\n", *p);
STAT(tunnel_rx_errors);
return ;
}
if (*b && *b < sizeof(pass))
memcpy(pass, b + 1, *b);
pass[*b] = 0;
- LOG(3, 0, s, t, "PAP login %s/%s\n", user, pass);
+ LOG(3, s, t, "PAP login %s/%s\n", user, pass);
}
if (session[s].ip || !session[s].radius)
{
p[4] = 0; // no message
if (session[s].ip)
{
- LOG(3, session[s].ip, s, t, "Already an IP allocated: %s (%d)\n", inet_toa(htonl(session[s].ip)), session[s].ip_pool_index);
+ LOG(3, s, t, "Already an IP allocated: %s (%d)\n",
+ fmtaddr(htonl(session[s].ip), 0), session[s].ip_pool_index);
+
session[s].flags &= ~SF_IPCP_ACKED;
}
else
{
- LOG(1, 0, s, t, "No radius session available to authenticate session...\n");
+ LOG(1, s, t, "No radius session available to authenticate session...\n");
}
- LOG(3, 0, s, t, "Fallback response to PAP (%s)\n", (session[s].ip) ? "ACK" : "NAK");
+ LOG(3, s, t, "Fallback response to PAP (%s)\n", (session[s].ip) ? "ACK" : "NAK");
tunnelsend(b, 5 + (p - b), t); // send it
}
else
run_plugins(PLUGIN_PRE_AUTH, &packet);
if (!packet.continue_auth)
{
- LOG(3, 0, s, t, "A plugin rejected PRE_AUTH\n");
+ LOG(3, s, t, "A plugin rejected PRE_AUTH\n");
if (packet.username) free(packet.username);
if (packet.password) free(packet.password);
return;
free(packet.password);
radius[r].id = p[1];
- LOG(3, 0, s, t, "Sending login for %s/%s to radius\n", user, pass);
+ LOG(3, s, t, "Sending login for %s/%s to radius\n", user, pass);
radiussend(r, RADIUSAUTH);
}
}
r = session[s].radius;
if (!r)
{
- LOG(1, 0, s, t, "Unexpected CHAP message\n");
+ LOG(1, s, t, "Unexpected CHAP message\n");
// FIXME: Need to drop the session here.
if (l < 4)
{
- LOG(1, 0, s, t, "Short CHAP %u bytes\n", l);
+ LOG(1, s, t, "Short CHAP %u bytes\n", l);
STAT(tunnel_rx_errors);
return ;
}
if ((hl = ntohs(*(u16 *) (p + 2))) > l)
{
- LOG(1, 0, s, t, "Length mismatch CHAP %u/%u\n", hl, l);
+ LOG(1, s, t, "Length mismatch CHAP %u/%u\n", hl, l);
STAT(tunnel_rx_errors);
return ;
}
if (*p != 2)
{
- LOG(1, 0, s, t, "Unexpected CHAP response code %d\n", *p);
+ LOG(1, s, t, "Unexpected CHAP response code %d\n", *p);
STAT(tunnel_rx_errors);
return;
}
if (p[1] != radius[r].id)
{
- LOG(1, 0, s, t, "Wrong CHAP response ID %d (should be %d) (%d)\n", p[1], radius[r].id, r);
+ LOG(1, s, t, "Wrong CHAP response ID %d (should be %d) (%d)\n", p[1], radius[r].id, r);
STAT(tunnel_rx_errors);
return ;
}
if (l < 5 || p[4] != 16)
{
- LOG(1, 0, s, t, "Bad CHAP response length %d\n", l < 5 ? -1 : p[4]);
+ LOG(1, s, t, "Bad CHAP response length %d\n", l < 5 ? -1 : p[4]);
STAT(tunnel_rx_errors);
return ;
}
p += 5;
if (l < 16 || l - 16 >= sizeof(session[s].user))
{
- LOG(1, 0, s, t, "CHAP user too long %d\n", l - 16);
+ LOG(1, s, t, "CHAP user too long %d\n", l - 16);
STAT(tunnel_rx_errors);
return ;
}
run_plugins(PLUGIN_PRE_AUTH, &packet);
if (!packet.continue_auth)
{
- LOG(3, 0, s, t, "A plugin rejected PRE_AUTH\n");
+ LOG(3, s, t, "A plugin rejected PRE_AUTH\n");
if (packet.username) free(packet.username);
if (packet.password) free(packet.password);
return;
}
radius[r].chap = 1;
- LOG(3, 0, s, t, "CHAP login %s\n", session[s].user);
+ LOG(3, s, t, "CHAP login %s\n", session[s].user);
radiussend(r, RADIUSAUTH);
}
u8 *o = (p + 4);
LOG_HEX(5, "PPP LCP Packet", p, l);
- LOG(4, 0, 0, 0, "PPP LCP Packet type %d (%s len %d)\n", *p, ppp_lcp_types[(int)*p], ntohs( ((u16 *) p)[1]) );
- LOG(4, 0, 0, 0, "Length: %d\n", l);
+ LOG(4, 0, 0, "PPP LCP Packet type %d (%s len %d)\n", *p, ppp_lcp_types[(int)*p], ntohs( ((u16 *) p)[1]) );
+ LOG(4, 0, 0, "Length: %d\n", l);
if (*p != ConfigReq && *p != ConfigRej && *p != ConfigAck)
return;
int length = o[1];
if (length < 2)
{
- LOG(4, 0, 0, 0, " Option length is %d...\n", length);
+ LOG(4, 0, 0, " Option length is %d...\n", length);
break;
}
if (type == 0)
{
- LOG(4, 0, 0, 0, " Option type is 0...\n");
+ LOG(4, 0, 0, " Option type is 0...\n");
x -= length;
o += length;
continue;
{
case 1: // Maximum-Receive-Unit
if (length == 4)
- LOG(4, 0, 0, 0, " %s %d\n", lcp_types[type], ntohs(*(u16 *)(o + 2)));
+ LOG(4, 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);
+ LOG(4, 0, 0, " %s odd length %d\n", lcp_types[type], length);
break;
case 2: // Async-Control-Character-Map
if (length == 6)
{
u32 asyncmap = ntohl(*(u32 *)(o + 2));
- LOG(4, 0, 0, 0, " %s %x\n", lcp_types[type], asyncmap);
+ LOG(4, 0, 0, " %s %x\n", lcp_types[type], asyncmap);
}
else
- LOG(4, 0, 0, 0, " %s odd length %d\n", lcp_types[type], length);
+ LOG(4, 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 0x%x (%s)\n", lcp_types[type], proto,
+ LOG(4, 0, 0, " %s 0x%x (%s)\n", lcp_types[type], proto,
proto == PPPCHAP ? "CHAP" :
proto == PPPPAP ? "PAP" : "UNKNOWN");
}
else
- LOG(4, 0, 0, 0, " %s odd length %d\n", lcp_types[type], length);
+ LOG(4, 0, 0, " %s odd length %d\n", lcp_types[type], length);
break;
case 4: // Quality-Protocol
{
u32 qp = ntohl(*(u32 *)(o + 2));
- LOG(4, 0, 0, 0, " %s %x\n", lcp_types[type], qp);
+ LOG(4, 0, 0, " %s %x\n", lcp_types[type], qp);
}
break;
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);
+ LOG(4, 0, 0, " %s %x\n", lcp_types[type], magicno);
}
else
- LOG(4, 0, 0, 0, " %s odd length %d\n", lcp_types[type], length);
+ LOG(4, 0, 0, " %s odd length %d\n", lcp_types[type], length);
break;
case 7: // Protocol-Field-Compression
case 8: // Address-And-Control-Field-Compression
- LOG(4, 0, 0, 0, " %s\n", lcp_types[type]);
+ LOG(4, 0, 0, " %s\n", lcp_types[type]);
break;
default:
- LOG(2, 0, 0, 0, " Unknown PPP LCP Option type %d\n", type);
+ LOG(2, 0, 0, " Unknown PPP LCP Option type %d\n", type);
break;
}
x -= length;
LOG_HEX(5, "LCP", p, l);
if (l < 4)
{
- LOG(1, session[s].ip, s, t, "Short LCP %d bytes\n", l);
+ LOG(1, s, t, "Short LCP %d bytes\n", l);
STAT(tunnel_rx_errors);
return ;
}
if ((hl = ntohs(*(u16 *) (p + 2))) > l)
{
- LOG(1, 0, s, t, "Length mismatch LCP %u/%u\n", hl, l);
+ LOG(1, s, t, "Length mismatch LCP %u/%u\n", hl, l);
STAT(tunnel_rx_errors);
return ;
}
if (*p == ConfigAck)
{
- LOG(3, session[s].ip, s, t, "LCP: Discarding ConfigAck\n");
+ LOG(3, s, t, "LCP: Discarding ConfigAck\n");
session[s].flags |= SF_LCP_ACKED;
}
else if (*p == ConfigReq)
u8 *o = (p + 4);
u8 response = 0;
- LOG(3, session[s].ip, s, t, "LCP: ConfigReq (%d bytes)...\n", l);
+ LOG(3, s, t, "LCP: ConfigReq (%d bytes)...\n", l);
if (config->debug > 3) dumplcp(p, l);
while (x > 2)
if (response && response != ConfigNak) // rej already queued
break;
- LOG(2, session[s].ip, s, t, " Remote requesting asyncmap. Rejecting.\n");
+ LOG(2, s, t, " Remote requesting asyncmap. Rejecting.\n");
if (!response)
{
q = makeppp(b, sizeof(b), NULL, 0, t, s, PPPLCP);
if ((q - b + 11) > sizeof(b))
{
- LOG(2, session[s].ip, s, t, "LCP overflow for asyncmap ConfigNak.\n");
+ LOG(2, s, t, "LCP overflow for asyncmap ConfigNak.\n");
break;
}
else
sprintf(proto_name, "%#4.4x", proto);
- LOG(2, session[s].ip, s, t, " Remote requesting %s authentication. Rejecting.\n", proto_name);
+ LOG(2, s, t, " Remote requesting %s authentication. Rejecting.\n", proto_name);
if (!response)
{
if ((q - b + length) > sizeof(b))
{
- LOG(2, session[s].ip, s, t, "LCP overflow for %s ConfigNak.\n", proto_name);
+ LOG(2, s, t, "LCP overflow for %s ConfigNak.\n", proto_name);
break;
}
break;
default: // Reject any unknown options
- LOG(2, session[s].ip, s, t, " Rejecting PPP LCP Option type %d\n", type);
+ LOG(2, s, t, " Rejecting PPP LCP Option type %d\n", type);
if (!response || response != ConfigRej) // drop nak in favour of rej
{
q = makeppp(b, sizeof(b), NULL, 0, t, s, PPPLCP);
if ((q - b + length) > sizeof(b))
{
- LOG(2, session[s].ip, s, t, "LCP overflow for ConfigRej (type=%d).\n", type);
+ LOG(2, s, t, "LCP overflow for ConfigRej (type=%d).\n", type);
break;
}
response = *q = ConfigAck;
}
- LOG(3, session[s].ip, s, t, "Sending %s\n", ppp_lcp_types[response]);
+ LOG(3, s, t, "Sending %s\n", ppp_lcp_types[response]);
tunnelsend(b, l + (q - b), t);
if (!(session[s].flags & SF_LCP_ACKED))
}
else if (*p == ConfigNak)
{
- LOG(1, session[s].ip, s, t, "Remote end sent a ConfigNak. Ignoring\n");
+ LOG(1, s, t, "Remote end sent a ConfigNak. Ignoring\n");
if (config->debug > 3) dumplcp(p, l);
return ;
}
else if (*p == TerminateReq)
{
- LOG(3, session[s].ip, s, t, "LCP: Received TerminateReq. Sending TerminateAck\n");
+ LOG(3, s, t, "LCP: Received TerminateReq. Sending TerminateAck\n");
*p = TerminateAck; // close
q = makeppp(b, sizeof(b), p, l, t, s, PPPLCP);
if (!q) return;
}
else if (*p == EchoReq)
{
- LOG(5, session[s].ip, s, t, "LCP: Received EchoReq. Sending EchoReply\n");
+ LOG(5, s, t, "LCP: Received EchoReq. Sending EchoReply\n");
*p = EchoReply; // reply
*(u32 *) (p + 4) = htonl(session[s].magic); // our magic number
q = makeppp(b, sizeof(b), p, l, t, s, PPPLCP);
*p = CodeRej;
if (l > MAXCONTROL)
{
- LOG(1, 0, s, t, "Truncated Ident Packet (length=%d) to 1400 bytes\n", l);
+ LOG(1, s, t, "Truncated Ident Packet (length=%d) to 1400 bytes\n", l);
l = 1400;
}
q = makeppp(b, sizeof(b), p, l, t, s, PPPLCP);
}
else
{
- LOG(1, session[s].ip, s, t, "Unexpected LCP code %d\n", *p);
+ LOG(1, s, t, "Unexpected LCP code %d\n", *p);
STAT(tunnel_rx_errors);
return ;
}
LOG_HEX(5, "IPCP", p, l);
if (l < 5)
{
- LOG(1, 0, s, t, "Short IPCP %d bytes\n", l);
+ LOG(1, s, t, "Short IPCP %d bytes\n", l);
STAT(tunnel_rx_errors);
return ;
}
if ((hl = ntohs(*(u16 *) (p + 2))) > l)
{
- LOG(1, 0, s, t, "Length mismatch IPCP %u/%u\n", hl, l);
+ LOG(1, s, t, "Length mismatch IPCP %u/%u\n", hl, l);
STAT(tunnel_rx_errors);
return ;
}
}
session[s].flags |= SF_IPCP_ACKED;
- LOG(3, session[s].ip, s, t, "IPCP Acked, session is now active\n");
+ LOG(3, s, t, "IPCP Acked, session is now active\n");
- // clear LCP_ACKED flag for possible fast renegotiaion for routers
- session[s].flags &= ~SF_LCP_ACKED;
+ // clear LCP_ACKED/CCP_ACKED flag for possible fast renegotiaion for routers
+ session[s].flags &= ~(SF_LCP_ACKED|SF_CCP_ACKED);
return;
}
if (*p != ConfigReq)
{
- LOG(1, 0, s, t, "Unexpected IPCP code %d\n", *p);
+ LOG(1, s, t, "Unexpected IPCP code %d\n", *p);
STAT(tunnel_rx_errors);
return ;
}
- LOG(4, session[s].ip, s, t, "IPCP ConfigReq received\n");
+ LOG(4, s, t, "IPCP ConfigReq received\n");
if (!session[s].ip)
{
- LOG(3, 0, s, t, "Waiting on radius reply\n");
+ LOG(3, s, t, "Waiting on radius reply\n");
return; // have to wait on RADIUS reply
}
// form a config reply quoting the IP in the session
{
if (*p != 0x81 && *p != 0x83 && *p != 3)
{
- LOG(2, 0, s, t, "IPCP reject %d\n", *p);
+ LOG(2, s, t, "IPCP reject %d\n", *p);
memcpy(q + n, p, p[1]);
n += p[1];
}
p += p[1];
}
*(u16 *) (q + 2) = htons(n);
- LOG(4, session[s].ip, s, t, "Sending ConfigRej\n");
+ LOG(4, s, t, "Sending ConfigRej\n");
tunnelsend(b, n + (q - b), t); // send it
}
else
{
- LOG(4, session[s].ip, s, t, "Sending ConfigAck\n");
+ LOG(4, s, t, "Sending ConfigAck\n");
*p = ConfigAck;
if ((i = findppp(p, 0x81))) // Primary DNS address
{
{
*(u32 *) (i + 2) = htonl(session[s].dns1);
*p = ConfigNak;
- LOG(5, session[s].ip, s, t, " DNS1 = %s\n", inet_toa(session[s].dns1));
+ LOG(5, s, t, " DNS1 = %s\n", fmtaddr(session[s].dns1, 0));
}
}
if ((i = findppp(p, 0x83))) // Secondary DNS address (TBA, is it)
{
*(u32 *) (i + 2) = htonl(session[s].dns2);
*p = ConfigNak;
- LOG(5, session[s].ip, s, t, " DNS2 = %s\n", inet_toa(session[s].dns2));
+ LOG(5, s, t, " DNS2 = %s\n", fmtaddr(session[s].dns2, 0));
}
}
i = findppp(p, 3); // IP address
if (!i || i[1] != 6)
{
- LOG(1, 0, s, t, "No IP in IPCP request\n");
+ LOG(1, s, t, "No IP in IPCP request\n");
STAT(tunnel_rx_errors);
return ;
}
{
*(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(htonl(session[s].ip)));
+ LOG(4, s, t, " No, a ConfigNak, client is requesting IP - sending %s\n",
+ fmtaddr(htonl(session[s].ip), 0));
}
if (!(q = makeppp(b, sizeof(b), p, l, t, s, PPPIPCP)))
return;
if (l > MAXETHER)
{
- LOG(1, ip, s, t, "IP packet too long %d\n", l);
+ LOG(1, s, t, "IP packet too long %d\n", l);
STAT(tunnel_rx_errors);
return ;
}
// no spoof (do sessionbyip to handled statically routed subnets)
if (ip != session[s].ip && sessionbyip(htonl(ip)) != s)
{
- LOG(5, ip, s, t, "Dropping packet with spoofed IP %s\n", inet_toa(htonl(ip)));
+ LOG(5, s, t, "Dropping packet with spoofed IP %s\n", fmtaddr(htonl(ip), 0));
return;
}
+ // run access-list if any
+ if (session[s].filter_in && !ip_filter(p, l, session[s].filter_in - 1))
+ return;
+
// Add on the tun header
p -= 4;
*(u32 *)p = htonl(0x00000800);
if (tun_write(p, l) < 0)
{
STAT(tun_tx_errors);
- LOG(0, 0, s, t, "Error writing %d bytes to TUN device: %s (tunfd=%d, p=%p)\n",
+ LOG(0, s, t, "Error writing %d bytes to TUN device: %s (tunfd=%d, p=%p)\n",
l, strerror(errno), tunfd, p);
return;
if (write(tunfd, buf, len) < 0)
{
STAT(tun_tx_errors);
- LOG(0, 0, 0, 0, "Error writing %d bytes to TUN device: %s (tunfd=%d, p=%p)\n",
+ LOG(0, 0, 0, "Error writing %d bytes to TUN device: %s (tunfd=%d, p=%p)\n",
len, strerror(errno), tunfd, buf);
return;
LOG_HEX(5, "CCP", p, l);
switch (l > 1 ? *p : 0)
{
+ case ConfigAck:
+ session[s].flags |= SF_CCP_ACKED;
+ return;
+
case ConfigReq:
- if (l < 6)
- *p = ConfigAck; // accept no compression
- else
- *p = ConfigRej; // reject
+ if (l < 6) // accept no compression
+ {
+ *p = ConfigAck;
+ break;
+ }
+
+ // compression requested--reject
+ *p = ConfigRej;
+
+ // send CCP request for no compression for our end if not negotiated
+ if (!(session[s].flags & SF_CCP_ACKED))
+ initccp(t, s);
break;
default:
if (l > 1)
- LOG(1, 0, s, t, "Unexpected CCP request code %d\n", *p);
+ LOG(1, s, t, "Unexpected CCP request code %d\n", *p);
else
- LOG(1, 0, s, t, "Short CCP packet\n");
+ LOG(1, s, t, "Short CCP packet\n");
STAT(tunnel_rx_errors);
return;
if (!r)
{
- LOG(1, 0, s, t, "No RADIUS to send challenge\n");
+ LOG(1, s, t, "No RADIUS to send challenge\n");
STAT(tunnel_tx_errors);
return ;
}
- LOG(1, 0, s, t, "Send CHAP challenge\n");
+ LOG(1, s, t, "Send CHAP challenge\n");
{
// new challenge
int n;
if (size < 12) // Need more space than this!!
{
static int backtrace_count = 0;
- LOG(0, session[s].ip, s, t, "makeppp buffer too small for L2TP header (size=%d)\n", size);
+ LOG(0, s, t, "makeppp buffer too small for L2TP header (size=%d)\n", size);
log_backtrace(backtrace_count, 5)
return NULL;
}
if (l + 12 > size)
{
static int backtrace_count = 0;
- LOG(2, session[s].ip, s, t, "makeppp would overflow buffer (size=%d, header+payload=%d)\n", size, l + 12);
+ LOG(2, s, t, "makeppp would overflow buffer (size=%d, header+payload=%d)\n", size, l + 12);
log_backtrace(backtrace_count, 5)
return NULL;
}
return b;
}
-// Send initial LCP ConfigReq
+// Send initial LCP ConfigReq for PAP, set magic no.
void initlcp(tunnelidt t, sessionidt s)
{
- char b[500] = {0}, *q;
+ char b[500], *q;
if (!(q = makeppp(b, sizeof(b), NULL, 0, t, s, PPPLCP)))
return;
- LOG(4, 0, s, t, "Sending LCP ConfigReq for PAP\n");
+ LOG(4, s, t, "Sending LCP ConfigReq for PAP\n");
*q = ConfigReq;
*(u8 *)(q + 1) = (time_now % 255) + 1; // ID
*(u16 *)(q + 2) = htons(14); // Length
*(u8 *)(q + 10) = 3;
*(u8 *)(q + 11) = 4;
*(u16 *)(q + 12) = htons(PPPPAP); // PAP
- tunnelsend(b, 12 + 14, t);
+
+ LOG_HEX(5, "PPPLCP", q, 14);
+ tunnelsend(b, (q - b) + 14, t);
+}
+
+// Send CCP request for no compression
+static void initccp(tunnelidt t, sessionidt s)
+{
+ char b[500], *q;
+
+ if (!(q = makeppp(b, sizeof(b), NULL, 0, t, s, PPPCCP)))
+ return;
+
+ LOG(4, s, t, "Sending CCP ConfigReq for no compression\n");
+ *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